Caribbean music is big — and free — in the city’s parks this summer; my City Arts column details some of the best shows. There’s also music from Africa, Turkey, Syria, Brazil — almost everywhere, as well as the good ol’ USA. I’m off to teach my NYU class about “World Music,” a nebulous concept, so can’t report all the dates and places here/now, but check out calendars for Summerstage, River-to-River Festival, Celebrate Brooklyn, the BAM Rhythm & Blues Festival at Brooklyn’s Metrotech Center, and any of the other presenters mentioned in the piece. Global sounds are, by definition, everywhere.