I was never a huge fan of Barney the Dinosaur (he just wasn't as cool as Snuffy and Big Bird to me). However, I recently came across this two-part episode where Barney and his friends talk about how practice makes music.
Pianist Greg Murray shows the kids a few neat things that you can do with music once you've worked hard to learn a song. In this clip, Greg plays some different variations of Twinkle Twinkle Little Star:
Barney & Friends: Practice Makes Music (Part 1):
And Part 2 of Practice Makes Music:
The main point to take away is that Barney the Dinosaur's friend Greg practiced a lot to get to the point where he could have fun with any song, whether it was Mary Had a Little Lamb or Twinkle Twinkle Little Star.