Old LPs and 45s are VINYL records that were popular in the 1950s and 1960s. They were the primary way of listening to music before the invention of the cassette tape and the compact disc. Old LPs and 45s were made of a polyvinyl chloride material, which was a type of plastic. The 45s were 7-inch records that could hold one song on each side, while the LPs were 12-inch records that could hold multiple songs on each side.