In the mid-1960s, Warhol adopted the band the Velvet Underground, making them a crucial element of the Exploding Plastic Inevitable multimedia performance art show. Warhol, with Paul Morrissey, acted as the band's manager, introducing them to Nico (who would perform with the band at Warhol's request). While managing The Velvet Underground, Andy would have them dressed in all black to perform in front of movies that he was also presenting. In 1966 he "produced" their first album "The Velvet Underground & Nico", as well as providing its album art. His actual participation in the album's production amounted to simply paying for the studio time. After the band's first album, Warhol and band leader Lou Reed started to disagree more about the direction the band should take, and their artistic friendship ended. In 1989, after Warhol's death, Reed and John Cale re-united for the first time since 1972 to write, perform, record and release the concept album "Songs for Drella", a tribute to Warhol. In October 2019, an audio tape of publicly unknown music by Reed, based on Warhols' 1975 book, “"The Philosophy of Andy Warhol: From A to B and Back Again"”, was reported to have been discovered in an archive at the Andy Warhol Museum in Pittsburgh.