Question: What was the name of the previous solo studio album from the singer who launched the his first solo tour with the same name as his seventh studio album in 1987?

 Sponsored by Pepsi and spanning 16 months, the tour included 123 concerts to 4.4 million fans across 15 countries making it the second highest grossing tour of the 80s. Bad was the first solo concert tour by American recording artist Michael Jackson, launched in support of his seventh studio album "Bad" (1987).  When the tour concluded it grossed a total of $125 million, adding two new entries in the "Guinness World Records" for the largest grossing tour in history and the tour with the largest attended audience.  In April 1989, the tour was nominated for "Tour of the Year 1988" at the inaugural International Rock Awards. <SEP> The Greatest Hits Tour was the seventh concert tour by Australian singer Olivia Newton-John, in support of her seventeenth studio album "Back with a Heart" (1998).  It's her first solo tour (and her first shows in the United States) in 16 years, since the Physical Tour, in 1982. <SEP> Bad is the seventh studio album by American singer and songwriter Michael Jackson, released on August 31, 1987 in the United States by Epic Records and internationally by CBS Records.  "Bad" was recorded during the first half of 1987.  The lyrical themes include media bias, paranoia, racial profiling, romance, self-improvement and world peace.  The album cemented Jackson's status as one of the most successful artists of the 1980s.  It was released nearly five years after Jackson's previous solo studio album, "Thriller" (1982). <SEP> American singer Beyoncé has embarked on six concert tours during her solo career, four of which have been worldwide and two of which have been collaborative.  Her solo tour debut (whilst on hiatus with Destiny's Child) began in 2003, with the Dangerously in Love Tour.  Based predominantly in the United Kingdom, the tour received an unfavorable review from Dave Simpson of "The Guardian" based on Beyoncé's costumes and a confusion of her core audience at the time.  In 2007, she embarked on her first major solo world tour – The Beyoncé Experience, following Destiny's Child's disbandment in 2005.  The tour visited five continents and Beyoncé was lauded by music journalism for her simultaneous dancing and singing abilities.  Following the release of her 2008 third studio album "I Am... Sasha Fierce", Beyoncé embarked on her next world concert venture, the I Am... World Tour.  She collaborated with Thierry Mugler exclusively for the tour's costumes.  The I Am... World Tour also marked the first time Beyoncé had performed in South American countries.  Beyoncé saw her most commercially successful tour to date with 2013-2014's The Mrs. Carter Show World Tour.  Grossing US $229,727,960, the 132 date venture was criticised for the name of the tour, as Beyoncé appeared to be letting herself be known as simply Shawn "Jay-Z" Carter's wife, despite being proclaimed as a "modern-day feminist".  The tour itself however was lauded by music critics, who again praised Beyoncé's performance abilities and the more advanced production seen compared to her previous tours.