The discography of San Francisco-based thrash metal band Testament consists of fourteen studio albums, four live albums, five compilations, two extended plays, thirteen singles, and three video albums. Originally forming in 1983 under the name Legacy they released two demos titled Demo 1 and Demo 2 and have since gone on to become one of the most influential thrash metal bands of all time. The band has gone through numerous lineup changes with the only constant member being guitarist Eric Peterson.