Season Four
Season four is when I started to not like Glee that much, but I watched it anyway. There weren't very many songs that stuck out to me, but there were a few.Chasing Pavements
Supergirl is a great singer too! (Does anyone get that reference besides me?) Anyway, I've already said that covering an Adele song is no easy task, but the Rumour Has It/Someone Like You crushed it. I don't think this cover was spectacular, so I don't think the producers nailed it here, but there was something about it that made it memorable for me. I'm just not sure what that was.
The Scientist
I actually don't really remember this song being on Glee -- which isn't too surprising since I don't remember 80% of the songs from season four -- but when I was looking at the entire list of songs, I saw it, listened to it, and liked it.
Footloose
Unlike majority of the musicals they sing songs from in Glee, I actually have seen Footloose (the original and the remake) before watching this episode in which they sing Footloose. I just thought this was a really fun number and just generally enjoyed it.