Bay seniors looking for bona fide water music will find it in the Marina directly east of the St. Francis Yacht Club parking lot. There wizards from the Exploratorium have set up a device that captures the underwater music of the Bay. It is called the Wave Organ. Don’t expect Handel. It’s mostly whooshes, popping and glubbglubbing. If you’re not musical, you’ll enjoy the view from seating devised with remnants of 19th century tombstones. Check the tide timing for maximum musicality. Free.