I think the main goal of this show, besides entertaining the pre-kindergarten demographic, is to help kids develop an appreciation for music. Besides all the characters being walking/talking instruments, they're also named after famous musicians.
Ella is named after Ella Fitzgerald:
R.C. stands for Ron Carter I think:
Billie is Billie Holiday:
Buddy is named after Buddy Rich:
Bonus: Buddy Rich on the Muppet Show
Krupa gets his name from Gene Krupa:
And, of course, I think the most obvious one is Louis being patterned after Louis Armstrong:
Once again, the show debuts on Dec 23, 2008 at 7:00 a.m. on CBC. It's regular schedule is 6:00 and 9:00 a.m. on Saturday and 7:00 a.m. on Tuesday, Thursday, and Sunday. Watch for it.