Like all of Stephen Sondheim’s musicals, 1973’s A Little Night Music (based on Ingmar Bergman’s 1955 film, Smiles of a Summer Night) lives and dies on the strength of its verbiage. Sondheim’s furiously fast-flying lyrics and Hugh Wheeler’s book are utterly crucial in depicting the panoply of layered, fascinating characters and the tangled, beautiful tale they weave. Alas, great swathes of that tale’s words are lost in Marriott Theatre’s somewhat serviceable production of the musical.