Question: What year was the band, in which one member produced Guilty for Barbra Streisand, formed?
Sentence (from "Barry Gibb"): Barry Alan Crompton Gibb, {'1': ", '2': ", '3': ", '4': "} (born 1 September 1946) is a singer, songwriter, musician, and record producer who rose to worldwide fame as a co-founder of the group Bee Gees, one of the most commercially successful and critically acclaimed groups in the history of popular music, with his brothers, Robin and Maurice Gibb.
Relevant evidence: No