Yes. They didn't sing the songs live when filming.
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Yes, Joe Jonas did wear lip gloss in Camp Rock because the hair and makeup crew wanted to make his lips look shiny.
No, I just watched a live video. I know how Louis sounds when he is actually live. They don't lip sync.
Mostly lip sync. The voices you hear on Glee are the voices of the actors themselves. However, they first record the songs and then choreograph and film the episodes lip syncing. However, some actors, like Amber Riley, who plays Mercedes, sing and record while filming along with some lip syncing.
camp rock and camp star
Yes Austin moon (Ross Lynch) does lip sing the directors tell him to lip sing so it entertains people