Right now I've been listening to a lot of soundtrack music (well mostly Hamilton), but some of the bands I like are Imagine Dragons, Grace Vanderwaal (who is not technically a band), Unlike Pluto (also not a band), Twenty One Pilots, and Marshmello (tho Marshmello is also not a band). Also Hidden Citizens, they're not technically a band but they do some pretty epic soundtrack-type music. They mainly do "Epic Trailer Versions" of popular/retro songs. 

Hope this helps! 

OOH YES so some of these are artists, and some of them AW already mentioned, but here are some of my favorites: 

AURORA (She is such an amazing human being as well as a great singer/ songwiter/ musician), Imagine Dragons, the Lumineers, Queen, Grace Vaanderwaal, Coldplay, Twenty One Pilots, Cavetown. Ok hope that helped!

I have a few bands for you!

Rainbow Kitten Surprise (don't be thrown off by the name, their music is good)

Dr Dog (again, don't pay attention to the name)

The Decemberists

Tarkio

Fleet Foxes

I hope you like these, they're some of my faves

Some of these have been mentioned and some are artists but here are some recs: Twenty One Pilots, Imagine Dragons, NEEDTOBREATHE, Two Steps From Hell (for epic/fantasy music), The Lumineers, Whitney, mxmtoon, Coldplay, Rend Collective, OneRepublic, Home Free, Foster the People, Paramore, Owl City, WALK THE MOON, George Ezra, Khai Dreams, Surfaces. Also this is not a band but the Hamilton soundtrack is incredible and I highly recommend it if you like musicals. 

SWITCHFOOT!!!! COLONY HOUSE!!!!