Yeah, that's something Gary's discussed many times. He didn't like Ozzy's heavy drinking & drug use, which is ultimately why he left Thin Lizzy.
He was dedicated to strong live performances, and ended up walking off the stage mid-set with Thin Lizzy because they were so sloppy and drunk/high.
It's ironic, since Gary became a heavy drinker later in life, which contributed to his death. He was 5 times the legal limit when he had the cardiac arrest. That was a sad day for me..
This one with Glenn Hughes has a smokin' lead as well.
This "love song" has ridiculous riffs..