Every year summer seems to slip by faster than the last and, alas, here we are again, bidding farewell with the last big bang of Labor Day. Year-rounders will revel in a few weeks of Locals Summer before autumn settles in and steals away. Rest assured, however, that career musicians won’t just fall away like autumn leaves, but will continue doing their thing all through the year.

Weekly readers may recall a three-part Sound Waves series running through the history of the recording industry that…