Rock/metal/hardcore wise you could try Underoath, Maylene And The Sons Of Disaster, MyChildren MyBride, Coheed And Cambria, Bring Me The Horizon, Black Veil Brides, Escape The Fate, Silverstein, Atreyu, August Burns Red, Avenged Sevenfold, Before Their Eyes, The Birthday Massacre, Brand New, Breaking Benjamin, Bullet For My Valentine, Callahan, A Day To Remember, Hawthorne Heights, Killswitch Engage, Our Last Night, For Today, In Midst Of Lions, A Static Lullaby, System Of A Down, Thursday, I Killed The Prom Queen...
Um if you want specific songs my these artists that I recommend, let me know.