I know I'm hijacking an old thread, but this kinda pisses me off. So many people think metal would be less than poopie without a quality bass player. That's crazy.
If we're going to be particular and only talk about "heavy metal" as in old school stuff, I guess I can understand why you might think that but you're still wrong. Any band without a bassist blows chunks. Now if were referring to all metal including prog and tech death and whatnot, then that's just total ********. The bass is necessary to any metal act. Beyond creation, obscura, blotted science, ingested, first fragment, inferi, spawn of possession, and any other quality band would not be what they are without a bassist. You cannot make an 8 string guitar sound like a 6 string fretless bass or any bass for that matter. The scale length is too different and the pickups they use are completely different. Furthermore, any band worth a damn is going to be more creative with their harmonies. Its the bassists job to follow the chord progression as is (mostly), but the guitarist is going to be going for guide tones (probably). Or they might switch in their solos or whatever, but the guitarist cannot fill all roles. Now bands like liquid tension experiment wouldn't be what they are at all without the bassist, in this case a stick player, which I'm going to call an extended range bass in this situation because of the scale length, and percussive effect. Tony Levin would be greatly missed if he was not in that band.
I think its narrow minded to make statements like heavy metal would sound OK without bass. Heavy metal bands would sound like crap in my opinion without a bassist. If you think it would be fine , then you have never heard a talented bassist play.
The double bass drums do not drown the notes out if setup properly, only a garage band would screw up like that. And even if the guitar plays the same exact notes as the bass, they still sound different. I digress. I personally wouldn't mind hearing a heavy metal band with 2 bassists.