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There seems to be some debate over "the weight of attack." My arm weighs around 15 pounds. I can lift and drop all 15 pounds of arm weight drop freely using gravity or I can hold back and regulate the weight drop anywhere ranging from 40 grams all the way back up to 15 pounds. Of course velocity is the other important factor that works in conjunction with arm dropping.

Discuss.

Whatever you might say and imagine, I'll bet that you don't do this in normal playing practice. If you did, imagine the huge amount of (wasted) work you would put into preventing weight falling. Dropping weight as a piano technique is a chimera - it doesn't really happen and techniques based on it waste a lot of time before settling down into something quite different. This doesn't prevent a lot of people from going through life imagining it and teaching it, though.


John

lol you are so silly, rintincop. Drumour is on the right track here.
SIT on your keyboard, depressing the keys slowly. You will notice that no sound is made. This proves that it is the speed of articulation that creates sound, NOT the weight deposited on the keyboard.
You may lack the strength to depress keys quickly without weight. Therefore, you use weight to compensate for your lack of strength.
Using weight to compensate for lack of proper technique causes many, many problems in people's playing.

Arm dropping is not the answer to everything, nor is wrist dropping. The fingers must also be strong.

Just because your arm weighs 15 pounds doesn't mean you only have 15 pounds at your disposal. We have a lot more than that, but of course we must control it.

I'm not really sure what you're getting at overall, rintincop. What is the debate over weight of attack? Is this related to the escapement post you made last week?

i read Bernstein's book on the subject and he thinks that so called 'dead drop' or purely gravity drop is faulty technique and even those who advocate it didn't actually do exactly as they thought when playing. the point is that no matter what you use in your playing, fingers, hands or arms or body, with weight or not, they're all controlled to achieve the sound, and nothing is just 'dead', or free or uncontrolled drop.

Vertical weight is the sworn enemy of building great technique.
rintincop:
Your piano couldn't care less how much your arm weighs. It isn't a bathroom scale. The speed of the hammer is affected by TWO variables:
SPEED and ACCELERATION of the depression of the key.
The amount of weight deposited on the keyboard is NOT one of these variables. The speed of your arm dropping into the key is in fact MUCH slower than the speed that can be achieved, with proper training, by the fingertip.

I agree with most of what you're saying, but the amount of weight behind a finger's keystrike affects the quality of sound...especially on a good piano. You can achieve a rounder tone using the weight of your arms.

NB, I'm not saying that a "rounder" tone is necessarily better in every case, but there are applications where it is presciptive. The opening and closing of Rachmaninov opus 3 no 2 comes immediately to mind.

A grand piano is an incredibly sensitive instrument and a pianist can exert a lot of control over the manner in which the hammer strikes the strings.

Not according to the laws of physics you can't.

Explain to me how you can achieve a rounder tone using the weight of your arms. Explain to me how the hammer will strike the key differently and therefore produce that rounder tone.

I'll run your explanation by my girlfriend's dad (a world famous Steinway tech who works CLOSELY with Anton Kuerti, Demidenko, Mitsuko and Pollini).

I couldn't begin to explain the physics behind it, but you can hear it. Try this exercise on a grand piano.

Play any 4 note chord FF as you ordinarily would. Play the same chord aiming for the same volume, but lower your wrist and allow more of your arm/body weight through to the keys. Try this a few times, varying the height of your wrist. The higher your wrist is, the brighter the tone. The lower your wrist is, the mellower the tone.

The level of your wrist controls the amount of arm weight that's transferred through to the keys -it acts as a fulcrum. I can certainly hear a difference in sound quality depending on the position of the wrist.

Perhaps if one thinks of the arm alone. But I think of the arm to wrist to finger as one long whip. The higher I start, the bigger the whiplike effect and the faster the acceleration (the wrist providing the swing and the arm gravity drop initiating the force). So I don't really look at this as a fingertip thing -- at least the way I play. My fingers are very strong though from supporting the impact from a fast whip.

I was taught using relaxation/arm gravity drop but as I analyzed it, I just understood the forces at work a little better. So often times we're all talking about the same thing but the description of absolutes (only arm or only fingers) are often incomplete.

I can say though that I'm never doing any finger pushing.

Well, going by the Taubman approach to technique, there is something in having "weight" in the keys, but its weight in a different way. The whole idea behind the Taubman definition of "weight" is just having your arm loose, because when your arm is tight and restricted it inhibits technique (going by the idea that your arm feels heavier when its relaxed and feels lighter when its tight). So i think that this definition of weight is different than the way you are using it.

(sorry if i am not being coherent; i am kind of tired right now)

But doesn't an object accelerate as it drops to a certain velocity? Isn't an arm that drops one foot going faster when it hits the keys than the same arm dropping one inch?

I know Galileo did some kind of experiment regarding this from the Leaning Tower of Pisa, but I can't quite remember the significance of it. Does it apply here?

Tomasino

I googled it up. Galileo dropped a ten pound weight and a one pound weight from the Leaning Tower of Pisa, and determined that they both accelerated at the same rate.

Point being for this discussion: they accelerated as they dropped. So the amount of weight is pretty much immaterial, as two pounds of arm weight is plenty to depress a key. You certainly don't need fifteen pounds. But that they do accelerate by gravitational force seems very significant here.

Tomasino

Your arm accelerates because of gravity, but the force transferred through your arm to the keys is a combination of the velocity and mass of your arm.

F=ma. (force=mass x acceleration)

So in response to Tomasino:
while a ten pound weight and one pound weight will both achieve the same velocity if dropped from the same height, the force of the ten pound weight on impact will be greater than the force of the one pound weight.

This is assuming total freefall (ie complete relaxation in which the arms falls like a lifeless weight).

That's my physics lesson, I offer no explanation as to how it affects a "rounder tone". Although all 3 of my previous teachers complained bitterly about my tone and tried to fix it. I have trouble hearing it, but at times I have.

Either tone is one big conspiracy contrived by some crazy elite pianist group, or some of us simply aren't at the point where we completely listen to the tone. Sometimes I get the feeling that I'm listening only to pitch and volume and I'm not aware of that other dimension of the sound.

unfortunately, in piano play, nothing is 'free fall' or just gravity, and therefore, the weight contributed to the sound wouldn't be like the direct result of a simple physics formula as metioned.

My 2 cents.

Simple physics. Gravity acceleration is 32 feet per second squared, regardless of weight. The higher the height, the faster the speed on impact.

Also simple physics, adding FORCE (i.e. pushing down from the shoulders to arms, WILL add to acceleration since this is going past regular gravity, thus adding to the equation above.

So to hit with more speed on the keys, one may either press the arms down, or just start from a higher height. Presumably this force is transmitted in the hammer throwing.

Now going back to arms, I'm going to make a reasonable guess that the longer arm extended to the fingers (being a longer fulcrum and larger power source, i.e. larger muscles), will have more potential for a higher force, with less effort, than the little finger.

But the little finger though has better ability to accelerate quicker with less effort which explains its ability for finer control.

This all translates to me, at least, that you need all the parts and they contribute to the whole equation.

Now tone is a more interesting thing. My understanding is that when a hammer hits the string at a certain level of force (and also location), the vibrations of the strings create a mix between fundamental tones and partials (overtones). What is perceived to be bad tone is too many partials. A dominant fundamental is the more attractive sound. So controlling the force of hammer throwing affects how it sounds. Hence the expression "good tone".

When designing pianos, the manufacturer is conscious of controlling all the parts so that the best tone is created most of the time. One's playing, unfortunately, can override this effort. This is what my teacher used to tell me before as my "banging the piano"

This is not as mad as it sounds (but physics doesn't enter into it). It is kinda the crux of the matter. When playing chords the balance of each note is effected by how you use your arm/hand/fingers. That creates a different tone and separates the men.... This CANNOT be done on a single note.

I don't think pianists who achieve good tone think about the physics. Actually, I'm almost certain no one thinks about that while playing. It seems ridiculous, we are not machines lol.

Arm weight has a lot to do with it of course and applying physics doesn't make much sense. Unfortunately, many pianists can't tell the difference between good tone and bad tone. They only hear the right note or wrong note, which imo is due to a lack of "ear". Most pianist don't really "listen" to what they are playing, and that is actually the hardest part. What you are hearing when you play is not always what you may imagine it to sound like.

I say leave the physics to the mathematicians and let us musicians depend on our aural skills and depth of musicality to achieve good tone. None of this should be calculated in a mechanical sense.

My 2cents.

Yes, but there are pianists out there who not only think they can alter the tone of an individual notes BUT TEACH WAYS OF DOING SO. Sadly Tobias Matthay was one.