Frank Zappa ( b10 )

 In a surviving 1967 radio interview, Zappa explained that the album's outlandish 11-minute closing track, "Return of the Son of Monster Magnet" was in fact an unfinished piece. The track (as it appears on the album) was created to act as the backing track for a much more complex work, but MGM refused to approve the additional recording time Zappa needed to complete it, so (much to his chagrin) it was issued in this unfinished form.

During the recording of Freak Out!, Zappa moved into a house in Laurel Canyon with friend Pamela Zarubica, who appeared on the album. The house became a meeting (and living) place for many LA musicians and groupies of the time, despite Zappa's disapproval of their illicit drug use. After a short promotional tour following the release of Freak Out!, Zappa met Adelaide Gail Sloatman. He fell in love within "a couple of minutes", and she moved into the house over the summer. They married in 1967, had four children and remained together until Zappa's death.

Wilson nominally produced the Mothers' second album Absolutely Free (1967), which was recorded in November 1966, and later mixed in New York, although by this time Zappa was in de facto control of most facets of the production. It featured extended playing by the Mothers of Invention and focused on songs that defined Zappa's compositional style of introducing abrupt, rhythmical changes into songs that were built from diverse elements. Examples are "Plastic People" and "Brown Shoes Don't Make It", which contained lyrics critical of the hypocrisy and conformity of American society, but also of the counterculture of the 1960s. As Zappa put it, "[W]e're satirists, and we are out to satirize everything." At the same time, Zappa had recorded material for an album of orchestral works to be released under his own name, Lumpy Gravy, released by Capitol Records in 1967. Due to contractual problems, the album was pulled. 

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