The Bee Gees are a musical group that originally comprised three brothers: Barry, Robin, and Maurice Gibb. The trio was successful for most of their 40-plus years of recording music, but they had two distinct periods of exceptional success: as a pop act in the late 1960s and early 1970s, and as a foremost act of the disco music era in the late 1970s. The group sang three-part tight harmonies that were instantly recognisable; Robin's clear vibrato lead was a hallmark of their earlier hits, while Barry's R&B falsetto became their signature sound during the late 1970s and 1980s. The brothers co-wrote all of their own hits, as well as writing and producing several major hits for other artists.