Over the years, a wide variety of session musicians played for Optigan. The earliest sessions were produced in Cologne, Germany, and constitute the bulk of material that was actually released as discs. The German session musicians can be heard chatting away auf Deutsch in the background of many of the master tapes. Back in the USA, musicians included Johnny Largo (who mostly just played the keyboard scales), ex-members of the Lawrence Welk Orchestra (on all of the big band discs), The Nitty Gritty Dirt Band (on “Bluegrass Banjo,” et al), Frederic Noad (a guitar teacher for Public Television, he recorded all of the solo acoustic guitar discs), Mike LeDoux (on the “Guitar Boogie” disc), Chet Ricord (drums), and many other anonymous session guys.