Take for example the Kranky Label, it has those really weird bands (like Godspeed, Low, Neu!, Out Hud, ..) and now take Warp records, they have electronic bands (like Squarepusher, Boards of Canada, Autechre), and now take Fat Cat, it has more of the beautiful, magical music (like Sigur Ros, Múm, Bjork, ...), and now take...
You can go on like this for ages. Most labels (record companies) have only one style of music (not like the big ones like EMI, Sony, ... They have all the musicgenres)
And sometimes i DO feel like listening to Fat Cat, or maybe Warp Records..
That's why it would be really useful