Summer music’s already in full-swing around the borough, but today, the tunes will be inescapable. This first day of summer is Make Music NY 2010, a day of free, public concerts around the city to celebrate the start of the new season. Hundreds of concerts, in every genre imaginable, are going on until 10 p.m. over all five boroughs, with 140 venues in Brooklyn alone. We can’t begin to give you the highlights, but here’s the full Brooklyn listing with great stuff from BK Bridge Park to Brownsville. And if you’re inspired, you can get out there and jam yourself, on one of Brooklyn’s 10 public pianos from the Play Me, I’m Yours installation through Jul. 5.