I watched these episodes as a kid when they were shown on CBS the first time.
After about 10 spins or so it became obvious (or so I thought at the time) that he was waiting for a certain corner-corner-this.square combination to come up and then it would always stop on the $+spin square. There was nothing musical in there at all.
Musical hacks. It sounds like he hit STOP every time a certain note played. Maybe he noticed a pattern that whenever someone hit "stop" on that note it landed on a "big bucks" icon. So account for reaction time/delay, and ta-daa. $100,000.
He realized that there were a set number of patterns. Once he figured that out it was easy to hit the button when the next square was going to be the one he wanted.
After about 10 spins or so it became obvious (or so I thought at the time) that he was waiting for a certain corner-corner-this.square combination to come up and then it would always stop on the $+spin square. There was nothing musical in there at all.