Wikipedia
Dancin' is a musical revue first produced in 1978, directed and choreographed by Bob Fosse, who won a Tony Award for the choreography. The show is a tribute to the art of dance, and the music is a collection of mostly American songs, many with a dance theme, from a wide variety of styles, from operetta to jazz to classical to marches to pop.
"Dancin'" is a song by American R&B group Guy recorded for their third studio album Guy III (2000). The song was released as the album's debut single in October 1999.
Although the group was long past their late-1980s/early-1990s heyday at this point, "Dancin'" would become Guy's highest charting single on the Billboard Hot 100 (and their only song to crack the top 40) to date, reaching #22 on that chart. It was also a top 5 hit on the R&B chart.