In music Instruments overpower vocals on my computer. (Headphones, Speakers, etc.)?

This isn't always prevalent, but is incredibly annoying, especially when the voice appears frail in comparison to the instruments. (I listen to bands like As I Lay Dying, Korn, All That Remains, In Flames, Eminem, Cradle of Filth, Thousand Foot Krutch, Lil Wayne, Godsmack, Breaking Benjamin, Slipknot, Demon Hunter, NWA, Lamb of God, Suicide Silence, Lupe Fiasco, Lonely Island, and Whitechapel, to give you a frame of what my music sounds like, and to dispell the notion that it is one type of music that is doing this)