I made the transition from AM to FM in 1969, after borrowing my step dad's table top FM radio. KMET in 1969 was waayyy "underground", and I remember feeling that I had stumbled on something very special. Jimmy Rabbit was a jock on KMET in SoCal at that time that I really liked. Jim Ladd was (IMO) more commercialized and played a broader mix. By 1972, there wer so many FM option in SoCal that some of them had a hard time standing out. But 1969 and 1970 seemed like the genesis to me.