The episode of Glee that featured a song by Ke$ha was 'Blame it on the Alcohol'.
http://www.buddytv.com/articles/glee/listen-to-the-music-from-glee-32768.aspx
Brittany/Britney
bad romance (chorus glee) and poker face (rachel)
Silly Love Songs.
i think there is about 11 songs on that episode including the sectionals but if not then 5 songs
Episode 8- Furt
Justin Bieber
Empire State of mind, Telephone, and Billionaire
Original Songs
Season Two, "Comeback".
Episode 8 - Mash-up