An artist could be continuing a storyline they'd already begun; like a film follow-up, building on an established set of characters. Or it could simply involve coming back to the same conceptual well, sticking to a theme they'd already explored, perfecting it. Sometimes, the sequel was just an aberration, an instrumental version of an existing song.

In recent history and hip-hop, there are some pretty noteworthy examples, although a few other genres slipped through as well. For the sake of brevity, though, a few had to get cut here. For example, some older R&B selections, like Stevie Wonder's incredible "Fingertips (Part 2)," which was essentially a live recording, or Marvin Gaye's "Got to Give It Up Part 2," because Part 1 is so much more common. Likewise, Wu Tang's "7th Chamber (Part 2)" is really more of a remix than a sequel; that got of thing got cut, too. In the end, we found the pieces of music that are continuations, the ones that—just like The Empire Strikes Back, The Dark Knight, or The Godfather Pt. II—these are The 25 Best Song Sequels