You've got an eye for music.

Yes, the actors do all their own singing, but you're also right that they generally don't do it on screen.

In an interview with Wired magazine, "Glee" co-creator Brad Falchuk confirmed what you suspected, but also gave a pretty honest explanation about why.

"It's very important to us that they do all of their own singing and dancing. That said, it takes four to eight hours to shoot a musical number, and it would be impossible for the actors to sing the number that many times that perfectly. In order to make it work from a production standpoint we prerecord the songs, then have the actors lip-sync on stage when we shoot." 

This, of course, adds another layer of production complexity. Not only do the actors (many of whom, let's remember, are pretty new to the screen biz) have to "nail" their takes, they have to nail them exactly the same way they did in the studio.

"We have someone there whose only job is to make sure the sync is good -- 99% of the time it works, every now and then it's not perfect."

He admits that it's during those imperfect times that people can notice the lip-syncing.

Of course, if it hadn't been the actors doing their own singing on the show, they would have gotten busted during the extensive "Glee" live tours they went on in the off-seasons.

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