Caption:
[1]"Mozart again, Peter... this time, a theme with variations."
[2]"I'll play it for you..."
[3]"Doesn't that sound familiar?"
[4]"Eh... Teletubbies?"

Funny note: when I thought up this joke, I had no idea that "Twinkle twinkle little star" (Mozarts "Ah vous-je dirai Maman") indeed pops up in the (Dutch) cd-version of the Teletubbies-titlesong. I found this out only two weeks later.