I just got asked to submit my answer to this question as a 'getting to know you' part of a quiz night being organised by a friend.
Thing is, looking through my rack, for every cd that is either just bad/dated/extreme/niche/whatever I know at least 2 people who would like to listen to it if they came round.
But generally, I gave my answer as Detrimentalist by Venetian Snares. I like it, I know people who like it a lot, but not many. But I think at least the quizmasters idea of 'having people round' does not go well with this cd.
My runner up was Erasure (Pop, 20 hits thing), which I think I bought off my brother when I was about 10. It might not be cool, but I imagine a load of people would actually like it if you did put it on. I definitely know 2 people would would be more than happy to have it on.
So, whats yours?