Given the following context:  On 20 July 1976, childhood friends Bernard Sumner and Peter Hook separately attended a Sex Pistols show at the Manchester Lesser Free Trade Hall. Both were inspired by the Pistols' performance. Sumner said that he felt the Pistols "destroyed the myth of being a pop star, of a musician being some kind of god that you had to worship". The following day Hook borrowed £35 from his mother to buy a bass guitar. They formed a band with Terry Mason, who had also attended the gig; Sumner bought a guitar, and Mason a drum kit. After their schoolfriend Martin Gresty declined an invitation to join as vocalist after getting a job at a factory, the band placed an advertisement for a vocalist in the Manchester Virgin Records shop. Ian Curtis, who knew them from earlier gigs, responded and was hired without audition. Sumner said that he "knew he was all right to get on with and that's what we based the whole group on. If we liked someone, they were in."Buzzcocks manager Richard Boon and frontman Pete Shelley have both been credited with suggesting the band name "Stiff Kittens", but the band settled on "Warsaw" shortly before their first gig, a reference to David Bowie's song "Warszawa". Warsaw debuted on 29 May 1977 at the Electric Circus, supporting the Buzzcocks, Penetration and John Cooper Clarke. Tony Tabac played drums that night after joining the band two days earlier. Reviews in the NME by Paul Morley and in Sounds by Ian Wood brought them immediate national exposure. Mason became the band's manager and Tabac was replaced on drums in June 1977 by Steve Brotherdale, who also played in the punk band Panik. Brotherdale tried to get Curtis to leave the band and join Panik, and even had Curtis audition. In July 1977, Warsaw recorded five demo tracks at Pennine Sound Studios, Oldham. Uneasy with Brotherdale's aggressive personality, the band fired him soon after the sessions: driving home from the studio, they pulled over and asked Brotherdale to check on a flat tyre; when he got out of the car, they drove off.In August...  answer the following question:  What did Bernard's band rename itself in 1978?
Answer:
Joy Division