Simplify the following text for a Grade 3 native English-speaking person.
Original: Ian Gillan ( born 19 August 1945 in Hounslow , London ) is an English rock music vocalist and songwriter , best known as the lead singer and lyricist for Deep Purple .
Simplified: Ian Gillan is the lead singer for the heavy metal band Deep Purple . He was born on August 19 , 1945 .