Glee: Who sang it?

Are you a gleek? The TV series "Glee" was immensely popular, and while the show had a great plot, we all came for the music! Can you name who sang their biggest songs, from solos to duets?

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Character singing statistics: Blaine Anderson (see comment for

His first episode he sang don't stop believin' and his last

Valerie, Glee Wiki

Glee (TV series) - Wikipedia

They Sang This on Glee, Glee Meme