This is one of multiple cinema advertising slides on Kete Horowhenua from Barnao's Music Shop.
Barnao's Music Shop was trading in Levin from 1962-1988. It was the passion of Giuseppe Antonio Barnao whose love of music began when we was gifted a clarinet in 1942. He worked in a music shop the following year and his talents saw him join dance bands and serve as an Army Bandsman. He was a member of Levin bands for decades. A web search will reveal lots of archived interviews and articles about Mr. Barnao. Barnao's shop printed advertising sleeves for the records they sold. The reference to 'the swinginest music store in town' would date this slide to the 1960s/very early 1970s! This slide would have been used to advertise the shop during a film at the cinema.