John Sebastian + the MonaLisa Twins bonded a little more than two years ago. It only took me 7 and 1/2 months to catch up with this “Make Up Your Mind” video. Apart from the fact that Sebastian is 50 years older than he was at the time of the ’69 Woodstock Festival, what’s the main takeaway? The fact that his voice has dropped a few octaves, and he can no longer sing this 1966 tune in G major.