Mark Sandman (September 24, 1952 – July 3, 1999) was an American singer, songwriter, musical instrument inventor and multi-instrumentalist. An indie rock icon and longtime fixture on the Boston music scene, Sandman was best known as the lead singer and slide bass player of the band Morphine. Sandman was also known as a prominent member of the Boston blues band Treat Her Right and the founder of Hi-n-Dry, a Cambridge, Massachusetts-based recording studio and independent record label.