How much music do we need? How much do we listen to?
Cor! iCloud is on the way! Amazon's Cloud Drive is already here! Mp3 players and iPods and disk drives - all those places to cram full of all that lovely music you own and love! And you love it all, right? All that music, you listen to it all, all the time? Nah.
According to Music With Me, you only bother to listen to a fifth of your iTunes collection. The figures aren't completely robust, however - if you rebuild your iTunes library, it resets the play counters - and the start-up providing the figures has a vested interest in the spin.
Still, assuming you haven't torrented every last quaver in your collection, how much music do you buy that rarely gets a second play, and how much do you really need to own? How big does your hard drive really need to be?