Simplify the following text for a Grade 6 native English-speaking person.
Original: David Jon Gilmour , CBE ( born 6 March 1946 ) is an English rock musician , best known as the lead guitarist , one of the lead singers and one of the main songwriters in the progressive rock band Pink Floyd .
Simplified: David Jon Gilmour CBE ( born 6 March 1946 ) is an English musician . He is most famous for being a guitarist , singer and songwriters in the rock band Pink Floyd .