Record only the words to the song either by speaking them or singing along with the song.
The actual recording will not be heard so it doesn't matter if you are in tune or not.
Place the recording in the Voice track of the character to generate the Lip phonemes.
Now you will have better lip syncing since the music will not confuse it.
Place your music in the music track.
Set the Voice Volume to 0 and the lips will move but no sound will come from the voice track but will come from the music track instead.
Just line up the music track clip with your recording in the voice track and the lips should move with the music.
Jeff
Get my Plugin Manager and TaskNotes plugins for iClone.
Check out EZColors and Other products for CTA/CA. EZColors: the easy way to change Render Styled (RS) colors!
See my CTA Tutorials on the YouTube channel CTAStepByStep