David Jon Gilmour is an English musician and multi-instrumentalist, who was the guitarist, lead vocalist and songwriter of the progressive rock band Pink Floyd. It is estimated that as of 2010, the group have sold over 250 million records worldwide, including 74.5 million units sold in the United States. In addition to his work with Pink Floyd, Gilmour has worked as a producer for a variety of artists, and has enjoyed a successful career as a solo artist. Gilmour has been actively involved with many charities over the course of his career. I…