Volz showed great skills in singing from a very early age. Being a self-taught musician, when he was 13 years old, he started his own band called The Wombats. As he grew up, he went on to share the stage with the likes of Janis Joplin, Chicago and others. In 1970 he became a born-again Christian and started performing with several Christian bands. He formed a band called Gideon's Bible, and later toured with a group known simply as e Band, which was a part of the Jesus Movement. e's only studio recordings can be found on the rock musical 2LP-album Because I Am released in 1973. After e broke up in 1975 Volz moved to Springfield, Missouri, where he worked with legendary guitarist Phil Keaggy. He also performed the lead role in a rock stage musical called Ezekiel.

In 1976, Volz received two of the most important calls of his life. First, he was offered the lead singer position of REO Speedwagon. Volz, being a recently converted Christian, declined. Six weeks later, he got the call to participate in Petra's second album, Come and Join Us. Although at that time he participated as a guest singer in just three songs, founder/guitarist Bob Hartman (who, at that time, was sharing the lead-singing duties with co-founder/guitarist Greg Hough) offered Volz the full-time position.

His first full-time album with the band, Washes Whiter Than, came in 1979 and therein came one of the most prolific periods of the legendary band. Volz remained the lead singer until 1985 when he left to pursue a solo career. Volz released his first solo effort, titled The River is Rising in 1986 under Myrrh Records. He followed it with three other moderately successful albums. During this time, he also toured with Joe English in a band called Pieces of Eight. Volz' tours drew in the 1,000 to 1,500 range during this time - a very respectable number for a Contemporary Christian artist, but no where near the level he experienced at the end of his tenure with Petra.

In the mid-90's, Volz decided to retire for some time. Apparently, during this time he was dealing with the divorce from his long-time wife, Becky. He resurfaced in 1998 with a string of new albums released from that year on.

In October 4, 2005 he re-joined Petra for the live recording of their last DVD, Petra Farewell. He joined the stage with current singer John Schlitt for a medley of ballads, and he followed it with a solo rendition of "Grave Robber", which was one of his hits with the band.

During his career, Volz has also lent his voice to numerous projects in the Christian music scene.