I don't know what ad you're referring to, each ad has a different song. Your best bet for finding it would be looking up the specific ad on YouTube. Once you find it, the song is probably a topic of discussion in the comment section.
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 :)
Snow [Hey Oh] by the Red Hot Chili Peppersgo the answer from http://www.beawesomeinstead.com/scrubs-musicit's the only site I could find with both Season 8 and Season 9 music.
Carolina Liar-Coming to Terms
O'death
Just saw the promo on Dubai one. The song is 42 by Coldplay.
The group is The xx and the song is crystalized
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"
The song is called 'Ride Wit Me' by Nelly.
Bust A Move by Young MC
It's a song called "Beautiful World" by Colin Hay.
heartbeats by Jose gonzales
"All of the Words" by Kutless
Rise by Eddie Vedder
"Walk" by Foo Fighters