 In the early 1960s, FM began to benefit from increased investment as broadcasters looked to it to expand their markets; television had been built out by this point, and the shift to music as the dominant format of AM in the wake of television and the rise of rock 'n' roll had led to an AM dial so crowded that the FCC was limiting many stations to daytime-only, a restriction FM was not subject to.The FCC gave FM two boosts in the early 1960s