From rock’s first supergroup, Cream, to grunge pioneer Nirvana and the pop-punk masters in Green Day, the power-rock trio is an undeniable musical force, scaled down to a simple equation of guitar, bass and drums, all amped up for maximum sonic effect. And that tradition is maintained by Denver trio Luna Sol, which comprises Dave Angstrom (guitar and vocals), Doug Tackett (bass) and Zeth Pedulla (drums). Hear for yourself when the band drops its latest album, Vita Mors, with a release show at Bar 404 on Friday, September 20.