The diva teamed with the Bee Gee for 'Guilty,' and on Oct. 25, 1980, the album and her single "Woman in Love" both topped the Billboard charts.
At the start of 1980, Barbara Streisand, then 37, was in the middle of a red-hot streak on the Billboard Hot 100, having landed eight consecutive top 40 hits in just two years. Among those were the No. 1s "You Don't Bring Me Flowers" with Neil Diamond and "No More Tears (Enough Is Enough)" with Donna Summer. At the same time, Barry Gibb, 33, was enjoying his own career high: He had just notched six straight No. 1 singles with the Bee Gees between 1977 and 1979.