David Gilmour was the lead guitarist and, along with
Roger Waters, lead vocalist for the progressive rock group
Pink Floyd. Gilmour joined Pink Floyd in 1968, when he was asked to replace former front man and guitarist
Syd Barrett. Barrett was becoming increasingly difficult to work with (due to his deteriorating mental state), so Gilmour stepped in to fill the void. Gilmour's contributions helped to define what would become known as the "Pink Floyd" sound.