David Scott `` Dave '' Mustaine ( born September 13 , 1961 ) is an American musician , best known as the founding guitarist-vocalist of the American thrash metal band Megadeth , and as the original lead guitarist for the American heavy metal band Metallica .
David Mustaine ( born September 13 , 1961 in La Mesa , California ) is the lead guitarist , songwriter and singer for the heavy metal band Megadeth .