Bad is the seventh studio album by the American singer and songwriter Michael Jackson. It was released on August 31, 1987, by Epic Records, nearly five years after Jackson's previous album, Thriller (1982). Written and recorded between January 1985 and July 1987, Bad was the third and final collaboration between Jackson and producer Quincy Jones, with Jackson co-producing and composing all but two tracks. Jackson adopted an edgy look and sound with Bad, departing from his signature groove-based style and high-pitched vocals. The album incorporates pop, rock, funk, R&B, dance, soul, and hard rock styles. Jackson also experimented with newer recording technology, including digital synthesizers and drum machines, resulting in a sleeker and more aggressive sound. Jackson wrote nine of the eleven songs on the album. Lyrical themes on the album include media bias, paranoia, racial profiling, romance, self-improvement, and world peace. The album features appearances from Siedah Garrett and Stevie Wonder.