I'm surprised not much ppl gave suggestions to the gd metal bands in SG.. Well I'm not sure if there's such a thing as a top metal band but here r some bands which IMHO think that r good:
Meza Virs
Rudra
Meltgsnow
Impiety
Flame of Dignity
And Anthony if u r lookin for a metal band to perform in the general public, gotta find a genre of metal that can be accepted by the masses. I'm not sure if the general public would like to see a NSBM type of band performin(they'll be most prob be arrested by the police too.. hehe...). Even a gd ol Death Metal band wont be easily digested by the public. So in my POV if u r plannin to showcase a metal band in an open public gig, its best to go with a "safe" band... Just a thought...