One Night Only

Skim the surface of the Las Vegas tour de force, One Night Only, from the Brothers Gibb, and you’ll chuckle over the Robin/Barry falsettos on such disco staples as ”Tragedy,” ”Stayin’ Alive,” and ”You Should Be Dancing.” Dig deeper, past the pitch-perfect three-part harmonies, into unforgettable classics like ”Words,” and the ”I Started a Joke” trio is no laughing matter. Thirty-six years on, the Bee Gees — castrati moments aside — look and sound great. B+