A lot of what I've come to listen to has been suggestions from friends. If you've got people ya know that are as interested in music as you are, talk to them about it! You'll find out about new artists for sure, but whether you like them or not is up in the air. Also, internet. Spotify is great because playlists are awesome and you can search for free music on there all day. Also if I find an artists I like I'll generally google them, look through the Wiki page on them and find the rest of their releases, other bands on the same record label as them, etc. And then go listen to as much of their stuff as I can and check out some other works that are similar. And if you know exactly what you're looking for, check out places specifically for those kind of things. Reddit has some great (and less than great) music subreddits that, depending how active they are, may help you find some new tunes similar to what you already like.