Music has not the thing like a popular artist always play good songs, it's also possible that a newer artist can create a bang. Finding out new artist and even older artist which are very much similar is only possible either by friends who somehow get to know above it or by searching on web like wikipedia but this is very limited in scope.
www.liveplasma.com is a new way to discover and broaden your taste of music and movies. It works by creating artist map whose genres and degree to similarity is very close and what everyone likes if he/she likes one of them.
The map is very flexible and useful, once you're in just go searching and roaming from one discovery to another. Click to Enlarge the Music Map which is created by searching 'Linkin Park'.