At the height of grunge, Morphine sounded like nobody else. The Boston trio built their own strange, seductive musical language (coined “low rock” by frontman Mark Sandman), built around Sandman’s two-string slide bass and unmistakable voice, Dana Colley’s baritone & tenor saxophone, and stripped-back drums (Jerome Deupree, Billy Conway).   Morphine became one of the defining cult bands of the ’90s, but their story came to an abrupt end in 1999, when Sandman suffered a fatal heart attack on stage during a concert in Italy.   More than 25 years later, Cocoon offers an extraordinary final chapter. Its eight songs were recorded during Morphine’s late-’90s sessions before Sandman ultimately shelved the material on the path toward what would become their final album.   Rediscovered in the band’s archives decades later, Sandman’s life partner and Morphine estate manager Sabine Hrechdakian and producer Paul Q. Kolderie (Radiohead, Pixies) transferred the original tapes and carefully assembled