#15. The Shmenge Brothers from SCTV
#14. My Pretty Pony from Veronica Mars
#13. The Riverbottom Nightmare Band from Emmet Otter's Jug-Band Christmas
#12. Dingoes Ate My Baby from Buffy the Vampire Slayer
#11. Brick Springhorn and the Tenth Avenue Band from a random Transformers comic
#10. Stillwater from Almost Famous
#9. Sonic Death Monkey from High Fidelity (Also known as Barry Jive and the Uptown Five or Kathleen Turner Overdrive.)
#8. Drive Shaft from Lost
#7. Dr. Teeth and the Electric Mayhem from The Muppet Show
#6. Timmy and the Lords of the Underworld/Faith Plus One/Fingerbang from South Park
#5. The Rutles from All You Need is Cash
#4. The Beets from Doug
#3. Dregs of Humanity from It's Your Move
#2. Dr. Funke's 100% Natural Good-Time Family Band Solution from Arrested Development (I couldn't get a picture of the "band," so instead here's one of Tobias' résumé)
#1. The Wonders (or the Oneders) from That Thing You Do! (Captain Geech and the Shrimp Shack Shooters, as well)
Honorable Mention: The Dangles from Rocko's Modern Life, who, of course, are a band that plays at a nudist colony. Why that show was never more popular, I have no idea.