Hark is a new welsh Sludge-Metal band in the vein of bands like Mastodon, High On Fire or Red Fang. I could conjure up a description but i've noticed they've descrived themselves pretty accurately on their bandcamp so why bother when i could just quote them:
"Ex. Taint frontman Jimbob Isaac returns with his new unit Hark. Their debut seven inch 'Mythopoeia' is released on July 30th, through the Destructure/SuperFi labels. The Welsh progressive-power-sludge trio carry Taint's torch forward, passed on from their legacy that began in 1994. With fresh chops and almighty riff power, Hark continue to fuse punk attack with Sabbathian dirge, and decorate post-whatever angularities with classic rock flourish. While Isaac's vocals expand on his tried and tested palette, his lyrics continue to shatter prose with bleak metaphor and acerbic spittle. Former Whyteleaf rhythm section Nikolai Ribnikov and Simon Bonwick, the Hark engine, bring an OCD approach to song craft, and endlessly creative pummel. Their dynamic chops, and blood lust for riffs meld with Isaac's honed and equally determined musical vision."
You should also check out Jimbob Isaac's old (now defunct) band Taint: