Just saw the promo on Dubai one. The song is 42 by Coldplay.
O'death
If you mean Season 2 it was 'Skinny Love' by 'Birdy' :) such a beautiful song
Season 7 used Johnny Cash's song "Ain't no Grave"
Rise by Eddie Vedder
The song is "Hear You Breathing" by "Stuart Reid"
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 :)
So Easy by Gina Cutillo
"Goodbye" by Rachel Rabin
sail
If Looks Could Kill - Jan Spillane
Beyond Freedom by AudioMachine
Carolina Liar-Coming to Terms