I'm going to choose three but it's hard. I'm only half way through series 2 so obv don't know the songs in the last 6 episodes. Does series 2 get any better by the way? Nowhere near as good as the first, still some gems though.
Mel's "More like in my dreams" song
Bowie, not the best episode but hilarious video / song
How did Dave get a hottie like that to a part like this? good one Dave!