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+


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