One of the places Brant Miller found himself before WLS Chicago was this FM top 40 in Honolulu. FM was definitely thriving on the island by 1975, as proven by this outstanding aircheck. In fact, as early as 1973 KGMQ was doing the top 40 format, according to this website.

I know next to nothing about Hawaiian radio, so I’d prefer to let visitors who remember this station comment below.