Reed had a hand in writing both sides, which bore the songwriting credit Vance-Sims-Reed-Phillips. Although the original 45 is very rare, it was reissued as part of the Velvet Underground bootleg The Velvet Underground Etc. in 1979. For what it's worth, Reed is credited with playing "ostrich"-styled guitar on The Velvet Underground & Nico (aka The Banana Album), presumably referring to his parts on tracks like European Son, on which he sounds like he's trying to strangle his own guitar strings.
Although the Primitives were a studio-only group to begin with, that changed when the single, improbably, generated interest from a TV dance show that wanted the group to appear on the program. Even more improbably, a backup band was assembled featuring Reed's new acquaintances from the Manhattan avant-garde underground: John Cale, sculptor Walter DeMaria (who would play drums), and filmmaker Tony Conrad (who like Cale was a member of the avant-garde ensemble La Monte Young's Theater of Eternal Music). For laughs, they played a few promotional shows around the East Coast, without getting themselves or their record much action.
John Cale, however, was struck when Reed told them that learning The Ostrich would be easy, as all the strings were tuned to a single note. This was similar to what Cale and Conrad were doing with experimental composer La Monte Young; Reed was applying a similar concept to rock & roll. The Primitives experience likely was one more factor that helped bind Reed and Cale together, starting a musical partnership that would flower into the Velvet Underground and prove hugely influential on the course of rock music. ~ Richie Unterberger, Rovi