Zelowitz also contributed significantly to the band 's songwriting .
Zelowitz also served as a second guitarist and occasional singer until his departure from the group in 1992 , after which the band essentially became Portman 's project .
Zelowitz also contributed significantly to the band 's songwriting and served as a second guitarist and occasional singer until his departure from the group in 1992 , after which the band essentially became Portman 's project .