Water Music: 5 premiers, sung and played at the Esplanade on the longest day of the year…this is what I call new music heaven…percussion, brass and voices. I can’t wait to hear what they all sound like out there, and I cannot imagine what the audience will experience as they wander through the Esplanade island near the Hatch Shell, among and between us performing musicians. It’s sure to be a great event–I have done other large-scale pieces with Maria Finkelmeier, the organizer (“In C”, “Inuksuit” at the Arboretum, playing the wall of the Green Monster during a light show), and trust her implicitly. These compositions are by Maria herself, Marti Epstein, Anthony Green, Neil Parsons and Manuel Garcia Albornoz. 7:30-9pm on Thursday, June 21, 2018, the River Charles in Boston…