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.