What would you say the worst song from each season is, and it has to be full-fledged songs, not just little short ones.
For me:
S1. You Got to Share, You Got to Care
S2. B.B.B.F.F.
S3. The Ballad of the Crystal Empire
S4. Flim Flam Miracle Curative Tonic
S5. Friends Are Always There For You
S6. It's Gonna Work
S7. Flawless
Haven't watched season 8 yet.