Sound Doctrine in its original form was a bluegrass Gospel music group from Michigan. Gary Duty, the founder, lead singer, and songwriter, was the lead guitar player, and also played the banjo and mandolin on certain tracks. His son, Tony Duty, played the electric bass. Tony’s wife, Christa, replaced Gary daughter as lead female vocalist when Gary’s daughter married and stopped traveling with the group.

While there have been other men that sang with Sound Doctrine, in its final form before they disbanded in 2004 or 2005, Barry Tuttle rounded out the group as harmony vocals, dobro, mandolin, and occasionally backup guitar.

Sound Doctrine broke up many years ago, but their music is still a blessing to many.

Bro. Duty revived the band in recent years with other members, but information on their new compositions and group makeup is not readily available.