It’s funny how music works. It seems every generation, the older folks complain how the music just isn’t as good as it used to be and the young people complain that the geezers just don’t get it. The Main Street barbershop quartet pays homage to this phenomenon in their performance at this year’s Barbershop Harmony Society. It takes a minute for them to get going, but once they start, they cover a slew of iconic pop songs from today and a while ago that will have you drowning in nostalgia.