The Monkees
The Monkees became tired of the same "formula" used in episode after episode of the series (Davy Jones would fall in love with a girl, and the rest of the band would help him get together with her), and wanted to try doing a variety show instead. NBC and the show's producers did not want to change the way the show was done. The two sides could not agree, and the show was cancelled, even though it was still popular.