In the years since their breakup, their work has come to the attention of garage rock fans and collectors and has appeared on several retrospective compilations including the Nuggets 4-CD box set.

During Hoyle's stint in Vietnam, the band had brought in Jim Hockstaff, known for his "Dionysian exploits," to become the group's lead singer and front man.

[1][3] The band, who had developed a large following in Fremont, went to Golden State Records' studio to cut their first single released on the Amber label, “Sometimes I Wonder” b/w “Tomorrow's Soul Sound” in April 1966.

In August 1966, the Harbinger Complex came out with their second single, “I Think I’m Down” b/w “My Dear and Kind Sir," which was released on the Brent label, and was recorded at United Studios in Los Angeles.

[1] Harbinger Complex's work has come to the attention of garage rock enthusiasts and collectors over the years and has been re-issued on several retrospective compilations, such as Mindrocker, Volume 10 and Nuggets, Vol.