Chris Frangou's Sound Theory is the solo work of bass virtuoso Chris Frangou. It was formed in 2004 as a musical project that consisted of Chris Frangou on all instruments and in 2007 the Sound Theory album titled Invasion was released featuring Chris Frangou on guitar, electric bass, drums and synthesizer. It was received extremely well critically and is known today as Chris Frangou's most rock orientated work. Chris Frangou's independent record label Envelope Music has recently announced that Chris Frangou is soon to assemble a 'Sound Theory Band' and that the next album will be of the Jazz Fusion genre.