Bananarama are an English female pop music vocal group formed in London in 1979 by friends Sara Dallin, Siobhan Fahey and Keren Woodward. Their success on both pop and dance charts have earned the group a listing in The Guinness Book of World Records as the all-female group with the most chart entries in the world, a record which they still hold. They released their debut single "Aie a Mwana" in 1981. Between 1982 and 2009, they had 28 singles reach the Top 50 of the UK singles chart. Their 10 UK Top 10 hits include "It Ain't What You Do..." (1982), "Really Saying Something" (1982), "Shy Boy" (1982), "Na Na Hey Hey Kiss Him Goodbye" (1983), "Cruel Summer" (1983), "Robert De Niro's Waiting..." (1984) and "Love in the First Degree" (1987). In 1986, they had a US number one with another of their UK Top 10 hits, "Venus". In total, they had 11 singles reach the US Billboard Hot 100 (1982-1988), including two more in the top 10, with "Cruel Summer" (1984) and "I Heard a Rumour" (1987). They are associated with the MTV-driven Second British Invasion of the US. In 1988, "Love in the First Degree" earned them a Brit Award nomination for Best British Single, while their fourth album Wow! (1987), topped the Australian album chart. Following Fahey's departure from the group in 1988, Jacquie O'Sullivan joined the group for three years and they had UK Top 10 hits with "I Want You Back" (1988) and "Help!" (1989). In addition to their chart success, the band is also known for their vocal style, generally singing in unison rather than in harmony like most vocal groups. Since 1992, Woodward and Dallin have continued Bananarama as a duo, with hits including "Movin' On" (1992) and "More, More, More" (1993). In 2005, they had their first UK Top 40 hits in 12 years, with the singles "Move in My Direction" and "Look on the Floor (Hypnotic Tango)".