Yeah, it can get especially interesting when two lyrics are being sung at the same time. Something like that happened during the last part of my "Carnival Cat vs. Ponyville" song in the last part when the Cat was singing along with the ponies of the Ponyville. Her original line was "Now you're mine you ponies can't resist. You make my life oh so rich." Unfortunately, it conflicted with the lyrics being sung by ponies ("Get away you psychopathic witch, you make us ponies sick...") making it sound like they were all singing "Get away you psychopathic b*tch!". Which, while funny, wasn't right. That's why I had to change Cat's lyrics to "Now you're mine, sweet babe I'm not a witch. Life alone just makes me sick."
And I would like to hear your lyrics for that song of yours.