All my favorite bands would take too long to list, so here's just a few of my all time favorites ^_^
Escape The fate
The Agonist
My Chemical Romance
Green Day
The Clash
Paramore
Black Veil Brides
Falling In Reverse
blessthefall
August Burns Red
A day To Remember
Eyes Set to Kill
Pantera
Metallica
The Dead Rabbitts
Evanescence
In This Moment
Get Scared
Halestorm
Slayer
Motionless In White
August Burns red
Cherri Bomb
Otep
Arch Enemy
System of a Down
Suicide Silence
The Pretty Reckless
Avenged Sevenfold
Neo Geo
Skrillex
Modern day Escape
Three days Grace
 
I put a lot of band merch and make a lot of sets about music, so the rest of the bands I like should be included there ^-^