Frank and Nancy Sinatra became the only father-daughter duo to top the Hot 100 with what DJs dubbed "the incest song."

"Headed right for the No. 1 spot on the Hot 100," read Billboard's review of Nancy and Frank Sinatra's "Somethin' Stupid" in 1967, and the prediction soon proved true.

On April 15, 1967, five weeks after the review was published, the song topped the chart and stayed there for four ­consecutive weeks.

The single, which is the only father-daughter duet to hit No. 1 -- Frank was 51 then, and Nancy 26 -- would rank at No. 7 on the year-end Hot 100 recap, and scored dad his sixth Grammy Award nomination for record of the year.

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