Matt Bayles (born October 19, 1972) is an American record producer, mixer, engineer, and musician, based in Seattle, Washington. Bayles (pronounced 'Bay-Less') is known for his work with bands such as The Classic Crime, Isis, Soundgarden, Pearl Jam, Botch, Mastodon, Minus the Bear, Burnt by the Sun, and Norma Jean and as the keyboardist for American indie rock band, Minus the Bear.