Pretty simple request, I'm looking for metal bands that consistently use a piano. Could be a trad metal band, could be thrash, either would work.

Any help would be appreciated.

Savatage uses piano in many of their songs as far as I know.

Savatage - Gutter Ballet

Savatage's gutter ballet, streets, etc. albums.

a greek band named Swan Christy actually wrote all their songs on the piano/keyboard and then wrote riffs and stuff round that, so they're even more piano-driven. needless to say, they were mainly influenced by Savatage

Well some of those also have a synt sound but you should check them out anyways: Europe,Dream Theater, Savatage,Star One,Deep Purple, Rainbow, The Grace Under Pressure album by Rush, Javan, Stratovarius, Uriah Heep, Virgin Steelee, Pretty Maids,