McCune would rent out his sound system, and personally operate the equipment for $1.00 an evening, on a Friday night.

In the 1940s, McCune Sound operated out of 10 Brady Street in San Francisco, which was centrally located near the Civic Center.

In 1969, the company moved to 951 Howard Street, and built an audio and video recording studio within the structure.

McCune Sound has been credited with creating and improving some of the vital concepts of the modern day live concert performance, and was one of the first sound companies to provide road touring sound systems, beginning in 1965 with Herb Alpert & The Tijuana Brass and progressing to diverse acts as Andy Williams, Dionne Warwick, the Grateful Dead, Jefferson Airplane, Creedence Clearwater Revival, Steely Dan, John Davidson, Crystal Gayle, and many others.

[6] Sound mixer Mort Feld said in 1969 that if all the touring acts brought their McCune equipment back at the same time, there would not be room enough in the shop.

McCune grabbed a loudspeaker, brought it back to the concert rehearsal, and then placed the speaker on the corner of the stage.

He then took an audio feed off the main system, turned up the mixer, and Miss Garland was pleased with the added monitor sound.

[12] McCune thrived in the concert market during the early 1970s and 1980s, and even branched out into stage theatre, supplying equipment for East Coast companies like ProMix and Masque Sound, at the same time creating the famed "wall of sound" for the Grateful Dead, and creating touring systems for Jefferson Airplane, CCR and others.

Abe moved to New York and worked on Jesus Christ Superstar, Evita, A Chorus Line, Beatlemania and many other shows using McCune equipment.