Background: "I Heard It Through the Grapevine" is a song written by Norman Whitfield and Barrett Strong for Motown Records in 1966. The first recording of the song to be released was produced by Whitfield for Gladys Knight & the Pips and released as a single in September 1967; it went to number two in the Billboard chart. The Miracles recorded the song first and included their version on their 1968 album, Special Occasion. The Marvin Gaye version was placed on his 1968 album In the Groove, where it gained the attention of radio disc jockeys, and Motown founder Berry Gordy finally agreed to its release as a single in October 1968, when it went to the top of the Billboard Pop Singles chart for seven weeks from December 1968 to January 1969 and became for a time the biggest hit single on the Motown label (Tamla).
Context: The Gladys Knight & the Pips version released on September 28, 1967 was on Motown's Soul label, with "It's Time to Go Now" on the B-side. Motown put little support behind it and the Pips relied on connections with DJs across the United States to get the record played. The Pips' version of "Grapevine" reached number one on the Billboard R&B chart on November 25, 1967, and stayed there for six weeks, making it the group's second R&B number one after 1961's "Every Beat of My Heart". It reached two on the Billboard Pop Singles chart the same month, with the Monkees' "Daydream Believer" holding top spot. It was Motown's best-selling single to that point. The song was later placed on the Gladys Knight & the Pips album Everybody Needs Love.  Whitfield wanted Gordy to release Gaye's "Grapevine" as a single, but Gordy didn't want to release another version after the Pips had already made a hit out of it. In September 1968, Whitfield added "Grapevine" to Gaye's new album In the Groove. On release "Grapevine" became a radio hit and, according to Gordy himself, "The DJs played it so much off the album that we had to release it as a single". So Gaye's version was released as a single on October 30, 1968. Gaye's "I Heard It Through the Grapevine" eventually outsold the Pips', and until The Jackson 5's "I'll Be There" 20 months later, was the biggest hit single of all time on the Motown label. It stayed at the top of the Billboard Pop Singles chart for seven weeks, from December 14, 1968 to January 25, 1969. Gaye's "Grapevine" also held number one on the R&B chart during the same seven weeks, and stayed at number one in the United Kingdom for three weeks starting on March 26, 1969. The label was pleased with the success, although Gaye, depressed because of issues such as the illness of singing partner Tammi Terrell (which would kill her less than a year later), was quoted as saying that his success "didn't seem real" and that he "didn't deserve it".  Due to the song's success, In the Groove was re-issued as I Heard It Through the Grapevine and peaked at number two on the R&B album chart and number sixty-three on the album chart, which was at the time Marvin's highest-charted solo studio effort to date. Because of the success of both versions, "I Heard It Through the Grapevine" was the first and last number one on the Billboard R&B chart in 1968: the Pips version was the first week of January, the Gaye version the last week of December. Gladys Knight was not pleased that Gaye's version usurped her own, and claimed that Gaye's version was recorded over an instrumental track Whitfield had prepared for a Pips song, an allegation Gaye denied. In 1985, one year following Gaye's death, the song was re-released in the UK reaching number eight thanks to a Levi's commercial (starring Nick Kamen).
Question: Did she go on any tours after this?

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