Heh, I actually liked this episode more than most of the others this season. It felt like it was as close to Glee season 1 as we're gonna get. I loved the NY side and thought the "Love Child" performance was hilarious.
Anyways, song spoilers for episode 10
Blaine, Sam Tina - Jumpin Jumpin (Destiny's Child)
Dani, Elliot, Kurt - The Happening (Supremes)
Rachel and Elliot - Vision of Love (Mariah Carey)
Will and Emma - Danny's Song (Loggins and Messina)
Santana, Rachel, Kurt - Gloria (Laura Branigan - i think? I don't know if it's this song or a different Gloria hah).