By the 1980s, Hansen Music ventured away from the pop field, focusing on classics and jazz method books.
[1] The firm, in 1980, was operating 7 retail sheet music stores — two in San Francisco, three in Seattle, and two in Las Vegas.
[1] The firm would later become inactive in December 1991, and the majority of its musical catalogue was eventually acquired by Alfred Publications.
The youngest, founded in 1971 by a longtime protégé of Charles Hansen, Frank Hackinson, was Screen Gems—Columbia Publications.
Working out of fully equipped and self-contained facilities in Florida, with staffs and arrangers, Screen Gems and Hansen accounted for about two-thirds of the industry's $140 million annual retail gross sales.
Prior to this, many musicians relied on unlicensed (illegally published) fake books when performing with ad-hoc musical groups for local jazz gigs or social occasions like weddings.
When the Hansen corporation began to grow, it needed more warehouse space, and later moved to the first floor of the same building.
In 1951 Hansen purchased the home of John Reed King at 4 North Drive, Malba, Queens.