Screamo band Celeb Look-a-Likes.

Great shit here.
There are quite a few of them, I only know a few of them.

Lead singer from Jamie's Elsewhere definitely looks like Jack Black.



Lead singer from Close Your Eyes looks like Daniel Tosh in this video.



Lead screamer/singer in The Ghost Inside somewhat looks like Adam Sandler in this video.



And yeah, that is all I could find tonight. xD