Try Beecake. I don’t know whether they are on amazon, they’re not very widely known…
But that doesn’t mean their music isn’t amazing. I hope you like them they’re sorta folk-country like…
I would HIGHLY recommend I Am Giant - a london based kiwi rock band.
I am their Social media and fan club manager and they are amazing live.
Check them out on youtube etc.
Crown The Empire (Also have 2 vocalists)
Dead By Sunrise 
if you’re willing to try something new I recommend you to listen to Children of Bodom… Finnish black metal & melodic death metal band… albums: follow the ripper, are you dead yet, relentless reckless forever
and Disturbed (Asylum, Indestructible )
also check out Seether, Atreyu, Lost Prophet … I hope you listen to Slipknot
Check out Eyeshine, A Day To Remember, I Fight Dragons, Inspired Flight, The Red Ribbon Army, Flobots and Kids These Days. All awesome in their own way.