took over on vocals. In 1986, after an additional demo produced by Hammett, which included his guitar tech John Marshall on 2nd guitar, Hammett brought the band to the attention of Mark Palmer at Music for Nations in England who signed Blind Illusion to a recording contract. By 1987, Gilson had left the band and Les Claypool re-joined for a third time while on a break from his band Primus. Before the recording of the album began, John Marshall left to join Metal Church and was replaced by ex-Possessed guitarist Larry LaLonde. Recording of the album commenced at Hyde Street Studios with Kirk Hammett producing. At the same time in the adjacent Alpha and Omega Studios, Blue Öyster Cult were recording their Imaginos album. BOC manager/producer/lyricist Sandy Pearlman heard Biedermann's playing and asked if he would like to guest on the album. Biedermann ultimately appears on several songs on the album alongside notable guitarists such as Joe Satriani and The Doors Robbie Krieger. In lieu of payment for his contributions to the album, Biedermann bartered for studio time to mix the Blind Illusion album since they had spent all of their advance money by that point. The resulting debut album The Sane Asylum was released in the spring of 1988 on Combat Records in the US and Music For Nations affiliate label Under One Flag in Europe. While Hammett did in fact produce the album, he is not credited as such because of Metallica management requiring payment to use his name, which Biedermann declined. The band embarked on a US tour to promote the release with Hallows Eve and At War. Halfway through the tour, Claypool returned to Primus and was replaced by Adam Gates for the remainder of the tour. After the band returned home in 1989, LaLonde also left the band to join Claypool in Primus. Blind Illusion then signed a recording contract with CBS Records and Biedermann brought in Vern Mc Elroy on bass, Wes Anderson on drums, and Mark Strausburgh on guitar. The band began recording their second album titled The Medicine Show but the project was shelved, and Blind Illusion disbanded shortly after when their contract with CBS was declared null and void after Sony bought out CBS and dropped several acts from the label. Mark Biedermann briefly played bass for Heathen on their Victims of Deception album in 1991. Biedermann left the music business