Now this is an intriguing idea:
http://www.bbc.co.uk/news/business-11948391

Can anyone see it catching on? I can imagine teenagers using it to advertise their taste.

The chances are that your music collection is pretty similar to whatever your mates own. If you own the whole of the Beatles back catalogue, your mates will too (OK, so everyone owns the Beatles...). Even if you're into something like Northern Soul, you can probably assume that at least some of your friends will know a thing or two about Gloria Jones or Edwin Starr.

But what acts do you love that you've never been able to persuade anyone else about? Which band or artist has made a career despite the fact that you're the only person you know who gets it?

I'll start: I love the Innocence Mission. I don't really know much about them, besides that two of them are husband and wife, and the singer has a beautiful voice. I've tried playing them to various people, but they're always seen as a bit too whimsical, a bit too in thrall to the Sundays among my mates. Here's a taster:

I'd also nominate The Concretes - perfect Swedish pop (to my ears at least). Anyway, here's your chance to finally win someone else over - share your personal favourites below. Or perhaps you prefer to keep them as 'your' band only?