Ideo- definition, a combining form representing idea, in compound words: ideology. See more.
On The Dark Side by John Cafferty & the Beaver Brown Band. This was written for Eddie and the Cruisers, a 1983 movie about a New Jersey bar band. In the film, the song becomes the band's big hit and leads to a second album and a conflict with their record company. Kenny Vance was the music supervisor on Eddie and the Cruisers.
The closing track on Pink Floyd's famous Dark Side of the Moon album, this seamlessly follows Brain Damage to close it out - radio stations almost always played the songs together. The album was well into production but didn't have an ending until Roger Waters came up with the song.