"B-Boys & Flygirls" is a song by Finnish hip hop group Bomfunk MC's that was released as the second single from their debut studio album, In Stereo. It was originally released in 1999, becoming a hit in their native Finland. Following the worldwide success of "Freestyler" the following year, the single was re-released as the "Y2K Mix" and became another hit for the group, charting within the top 20 in several mainland European countries and Australia. It was not released in the United Kingdom, where "Uprocking Beats" was chosen as the follow-up single instead.

In Stereo is the debut studio album by the Finnish hip hop group Bomfunk MC's, released on 2 June 1999 through Sony Music Finland. The album reached No. 1 on that year's Finnish albums chart and remained on that chart for 69 weeks. "Freestyler" was released as a single and became a chart-topping hit worldwide during the first half of 2000, reaching No. 1 in eleven countries.