Originally posted by Bardock42
So they are not interchangable, since they are made after the rest of the music (I am not sure if that's actually true though, I think Leonard Cohen was more interested in his poems, the Music just came around it, i also know Bob Dylan wrote lyrics first and then fitted the music, and I have read an interview with Thom Yorke where he said they came together he with new lyrics ideas they with new music ideas).
Some people write the lyrics first. A song is still written as an independent entity, though.
If you read the lyrics to 'Bald' by The Darkness, and then listen to the song, you can tell there's no correlation from lyrics to music- the lyrics are just made to fit the song. I doubt any song- or vocal that is- was specifically made to fit the lyric. It wouldn't make any sense, or have any real point.