20. Alanis Morrissette, "Thank U"
Tough call between "Thank U" and her City of Angels soundtrack theme "Uninvited" – but there's no beating the anthemic greatness of "Thank U," where Alanis gives thanks to India, Providence, frailty, disillusionment, etc. while learning a bunch of lessons about how to quit being a supposed former infatuation junkie. The line everybody had a blast over-interpreting: "How about them transparent dangling carrots?" Thank U, Alanis.