The pianist in question in that article is Richard Clayderman. I would think listening to his music if anything would put those tortoises to sleep.
Isn't this really just animal cruelty, forcing those poor defenseless creatures to endure that music? What did they ever do to deserve this?
I watched a bit of his playing on BBC Breakfast earlier this week and it's pretty much just a less than dizzying display of diatonic dullness.