Christopher Guest, Michael McKean and Harry Shearer first performed together live as Spinal Tap in a television show in the 1970’s. They later, with Rob Reiner, developed the characters in the Spinal Tap band and made a short film with improvised scenes and seven songs. In the process of attempting to turn that short film into a feature-length movie, they formed a joint partnership, “Spinal Tap Productions” (“STP”). On the strength of this work, on May 7, 1982, Reiner, Shearer, Guest, and McKean, as co-owners of STP, signed an agreement with Embassy Pictures for production, financing, and distribution of the motion picture This Is Spinal Tap.