They haven't, yet, at least. You can find a full list of songs sung on Glee on Wikipedia, at the related link below.
You may be thinking of the recently-remade version of 21 Guns from the Broadway production of American Idiot, which is a much more theatrical and Glee-sounding version. You can listen to it at the streamable related link below.
The song heard in the Glee Season 3 Promo's and the first song sung in season 3 is called "We got the Beat" originally sung by the Go Go's :)
See the related link below for a list.
The main vocals in Teenage Dream are sung by Darren Criss who plays Blaine on the show. The backing vocals are done by the a cappella groups The Beelzebubs, from Tufts University.
The proper title of the song is "Born This Way", and it is performed by Lady Gaga.
They sing "Valerie" twice on Glee.The first time, Valerie by The Zutons (Mark Ronson feat. Amy Winehouse version) is featured, it is in Special Education, the ninth episode of Season Two. It is sung by the New Directions, with Santana singing lead.The second time it is sung, Valerie is featured in 100, the twelfth episode of Season Five. It is sung by Brittany and Santana. They re-did the song previously sung in Special Education, the ninth episode of Season Two, as part of the show's special hundredth episode.
more than 300
the whole glee cast
This question is incomplete.
The song heard in the Glee Season 3 Promo's and the first song sung in season 3 is called "We got the Beat" originally sung by the Go Go's :)
A Chorus Line (Musical)
I think it was Amber Riley (Mercedes Jones)
The cast of hit show Glee came on and sung their rendition of the song made famous by Journey, Don't stop believing.
Guns 'n' Roses sung "Welcome to the Jungle"
Season 1, the final episode of the season. It was sung by Vocal Adrenaline while Quinn was having her baby.
Justin BIEBER is not singing on glee. the cute guy with blonde hair is singing some songs by him! I
That's an unreleased opening theme that has no name.
See the related link below for a list.