Extensive remodeling following World War II until the early 1950s led to expansion in the downtown Dallas store, which fostered the development of its band instrument division.
The company grew rapidly with renewed interest in electrical instruments, and had over 50 stores, plus a mail-order and e-commerce division to serve international customers.
In 2003 First Act Inc., a competitor that sells its instruments at mass market retailers sued Brook Mays and was awarded $16.7 million.
In July 2006, Brook Mays Music Group filed for Chapter 11 bankruptcy, citing poor back-to-school and holiday sales.
The entity now operates five retail stores (two in the Dallas/Fort Worth Metroplex plus the company office and showroom, and three in the Greater Houston area).