Sometimes I think we forget that classical & jazz musicians unfortunately have to work harder (vs pop musicians) to get their artistic message to the public. For that reason it keeps them more in touch with their audience so they know & appreciate them more. They usually have much more depth to their personality which makes them more approachable. All this makes them easier to talk to. From my years as a "working" musician, there were so many rock & pop players who couldn't be bothered with acknowledging the folks who paid to see their shows and came off very arrogant & phony.

I guess the point I'm trying to make is don't be afraid to compliment someone if you are truly moved. They WILL appreciate it.