49. Cher, "Believe"
"Do you believe in life after love?" is a question we all must ask sometime – but only Cher could answer. (Spoiler: Yes, dummy.) The best part is when her voice blends into the synthesizer – you can hear how excited the synthesizer is, like it's spent its whole life waiting for a chance to duet with Cher. "Believe" came out at the very end of 1998 and you could argue it really belongs to 1999, so it might be cheating to include it in this list at all. But Cher always gets the benefit of the doubt when it comes to turning back time. When her musical The Cher Show opens on Broadway later this year, count on "Believe" to bring down the house.