In every song that Mic the Microphone sings/raps even if he's the main singer, none of the bars to sing to are his, only the other singer. E.g. in Beyond her Tomb/Nightmare Night, 90% of the lyrics are Mic's but you only sing along to the occasional glaze lyrics. I really like Mic's voice and was hoping that his voice would be part of the actual sing-a-long.
Would anyone be up to editing those songs to include Mic's parts into the actual game?
Rapping parts are intentionally left without a singing bar, since you can't really sing a rap, i.e. there's no real pitch you can reproduce.
The only song with Mic singing in MLK is "No Chance", the collab song with dbPony.
That's not to say that you can't sing along anyway (I often do)
You just won't get scored on it