Flicking through Amazon I discovered you can get a free sampler album "this is loose" with a couple of free tracks by the rather wonderful Dawes, and Word CD favourites the Felice Brothers. A number of other freebie label compilations too.

Oh, and some interesting 4 track introductions for 99p, which seem to constitute the entire catalogue you might wish to have of some of the artists e.g. David Essex and the Sweet, and more than you might want of others (Sad cafe). Might fill a few gaps.