Though he left Iron Butterfly after only one album due to internal tensions,[3] his work was an influence in the band for most of their history, since his replacement Erik Brann made a conscious effort to imitate his playing.
In addition, the later album Live included a performance of "You Can't Win", a song from Heavy for which Weis wrote the music.
[3] He then reunited with several fellow members of Rhinoceros to form the band Blackstone, which broke up after one commercially unsuccessful album.
[6] In 1974 Weis played lead guitar on Lou Reed's Sally Can't Dance album and on the subsequent world tour.
[7] In December 2006, his debut solo album, an instrumental smooth jazz effort titled Sweet Spot, was released on Marshmellow Records.