That "memory foam" is the greatest thing since babies. I've been using a memory foam seat cushion for years now when I play the piano. I wouldn't play without it sitting on my piano bench. Also just bought a memory foam pillow. Wonderful! It holds my head in place so I don't toss 'n turn all night. My next purchase will be a memory foam accordion.
BTW......that bench Donny is talking about. I tried that at Sam Ash. I remember it because of the absolute comfort I felt immediately........soft and plush. You can't beat "soft and plush!"