That's a lovely tune, even when stripped down. It's a descending minor key pattern (i-v-iv-III-v) that's both melancholy and soothing at the same time.
But you're right about Ollie. The poor guy's got nuthin' to do.
I was at the Fillmore one time in '90s when the same thing happened. Fortunately, it was late in the evening, so we didn't miss too much of the regular show. After the power went out, Steve Miller finished up on acoustic, amplified through a megaphone!
BTW: You may be thinking, why pay good money to see the Steve Miller Band?!! Well, I was thinking that, too. Turns out I won the tickets, so what the heck.