No, police don't think the culprit is a musician, rather it's likely they're looking to pawn or fence the expensive musical items stolen. And, a set of keys stolen in the first break in were used the last two times!
When somebody is in possession of drug paraphernalia, they get popped. When somebody's in possession of known stolen property, same deal. But in this case, an obvious gas theft was prevented although the cops couldn't arrest the suspect.