Redirecting to https://www.spotify.com/us/ . You can find a majority of bands there, past to present, with a majority of their discography available to listen to. Even a lot of underground, indie stuff that isn't mainstream at all can be found on Spotify. If you find bands you like on there, it usually will recommend other similar artists and over time you will just discover things. Tell me, what are some bands you like already? What styles? Maybe I or others can just make a few recommendations here on stuff you're maybe not familiar with.