...so what do you call bands like Children of Bodom, In Flames, Arch Enemy, and Dark Tranquility? I'd have to say one of the most popular genres of mainstream metal is quickly becoming "melodic death metal". What IS "mainstream" anyways? The sound of the music being an overall generic sound or does it have to do with record sales and name recoginition? Either way, the bands listed above would meet these requirments I feel.