Jason Newsted is an American metal musician, known
for playing bass guitar with the bands Metallica, Voivod and Flotsam and Jetsam.
Joining Metallica in 1986 after Cliff Burton's death, Newsted remained a member until 2001, making him
the band's longest-serving bassist. After he left Metallica,
he continued with his project Echobrain,
played with Ozzy Osbourne and joined heavy metal band Voivod.
Newsted uses the pseudonym Jasonic, which serves as both his alias in Voivod and the name of
his music publishing company.
He currently plays in his self-titled band Newsted, in which he provides lead vocals as well as bass
-Wikipedia