I use tastekid.com. You put it in what you like and it will tell you similar things, whether it be music, films, books etc.
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See people blog about it on Tumblr, decided to listen to band myself. Literally the only way I've discovered new bands for last few months
radio..
Browsing youtube and listening to the radio. :)
I either use the radio, listen to covers of songs on youtube and have found new people using spotify; either through adverts, their radio, related artist feature or soundrop!
mostly music forums
main three really are drowned in sound, popjustice and pitchfork.
i used to read nme a lot, and a lot of bands from 2007/8/9 i've tend to stick with, so usually pretty excited when they release new stuff.
just through related videos on youtube mostlyyy
http://www.buzzjack.com/ mainly
yess last.fm is my life when it comes to new music.
it compares artists you listen too and helps find others like them, i loves ittt.
www.last.fm/user/emzee_x