5:12. During the time of the recording of the song and its subsequent album of the same name, Marvin had befriended the family of jazz guitarist Slim Gaillard and had become smitten with Gaillard's 17-year-old daughter, Janis Hunter. A widely reported story has been told that Hunter was in the studio when Gaye recorded the song at the recording booth. Gaye and Hunter were said to be smitten with each other and, within months, they began dating. Hunter would become Gaye's live-in lover by 1974. Their relationship would produce two children and a 1977 marriage. Release and reception "Let's Get It On" became, and remains to this day, one of Gaye's as well Motown Records' most successful singles, as it reached number 1 on the Billboard Pop Singles chart on September 8, 1973. The single remained at number 1 for two weeks, while also remaining at the top of the Billboard Soul Singles chart for eight weeks. In its first week at the top of the chart, "Let's Get It On" replaced "Brother Louie" by Stories, and was replaced by "Delta Dawn" by Helen Reddy; it later replaced "Delta Dawn" and was finally knocked off the top of the chart by Grand Funk Railroad's "We're an American Band". The single stayed inside the Billboard Hot 100 top 10 for 13 weeks, 10 of those weeks inside the top five. Billboard ranked it as the No. 4 song for 1973. The song became the biggest selling Motown release in the United States at the time, selling over two million copies within the first six weeks of following its release. "Let's Get It On" also became the second best-selling single of 1973, only surpassed in sales by Tony Orlando & Dawn's "Tie a Yellow Ribbon Round the Ole Oak Tree". At the time, the single was Motown's largest-selling recording ever, selling over four-million copies in 1973 and 1974. The single has gone on to sell over 1 million copies, and, on June 25, 2007, was certified platinum in sales by the RIAA. Cash Box said that the song was different from Gaye's previous songs and a "very accomplished effort a la Otis Redding or Al Green." A bluegrass version of the song was later recorded by Shannon Lawson on his 2002 album Chase the Sun. "Let's Get It On" was given a remix in 2004, when producers mixed Gaye's vocals with a