Art is a cyclical beast. The same can easily be said of Grammy Award nominated hard rock juggernaut Mastodon. The group's four members recognize the importance of life's omnipresent cycles on their sixth full-length album, Once More 'Round the Sun. The band orbits around themes of loss and rebirth, twirling a sonic spiral of its signature robust riffing, hypnotically haunting soundscapes, triage of dynamic voices, and thundering seismic grooves.