During his time in Vietnam, he worked as a band director, co-ordinating musical entertainment for US armed forces personnel.

[3] He formed the band Full Moon with jazz guitarist Buzz Feiten, and their self-titled debut album was released in 1972.

[2] In 1977, Larsen relocated to Los Angeles,[1] where he played on sessions by producers such as Tommy LiPuma, Russ Titelman and Herb Alpert.

[2] The title track from his second studio album, High Gear, was nominated for the 1980 Grammy Award for Best Rock Instrumental Performance.

[6] The album peaked at number 153 on the Billboard Top LPs & Tape chart in the US[7] and included musical contributions from Feiten, Michael Brecker, Steve Gadd and Paulinho da Costa.

[9] Larsen has worked as a session musician for many rock artists, including Rickie Lee Jones, George Harrison, Kenny Loggins and Don McLean.