Who/what would they/it be?
Not neccesarily your favourite band as they may have only a few albums of all the same mood. You'll need variety, volume and a lot of quality.

I think I would go for the Afghan Whigs, excellent run of albums, some excellent b-sides (miss world, if I only had a heart etc) songs to dance/fight/strut/f***/sulk to. What more could you need?