The Sunny Original Music Cassette is a Japanese Nissan/Datsun promotional cassette released for the Sunny model and intended for distribution with the car. The cassette itself bears the Datsun Sunny and JASRAC logos, along with the marking 非売品 ("not for sale"). The existence of this release is also confirmed by Japanese sources as a Nissan-branded, unsold cassette. A Nissan/Datsun Sunny promotional cassette, likely intended for karaoke and in-car sing-alongs, it features instrumental versions of ten popular Japanese hits from 1979–1980, and the surviving insert contains the lyrics to all the songs. This makes the release even more intriguing: it is, in fact, an early example of Japanese in-car karaoke promotion, created before karaoke became such a familiar part of Japanese popular culture.