Cat Stevens - Numbers (1975) LP

Numbers is the ninth studio album, and the first concept album by singer/songwriter Cat Stevens released in November 1975.

The album Numbers, subtitled "A Pythagorean Theory Tale," was based on a fictional planet in a far-off galaxy named Polygor. The album included a booklet with excerpts from a planned book of the same name written by Chris Bryant and Allan Scott. The booklet features pen-and-ink illustrations drawn by Stevens.

The concept of the album is a fantastic spiritual musical which is set on the planet Polygor. In the story there is a castle with a number machine. This machine exists to fulfill the sole purpose of the planet – to disperse numbers to the rest of the universe: 1, 2, 3, 4, 5, 6, 7, 8, and 9 (but notably not 0). The nine inhabitants of Polygor, the Polygons, are Monad, Dupey, Trezlar, Cubis, Qizlo, Hexidor, Septo, Octav, and Novim. As the first lines of the book say, they "followed a life of routine that had existed for as long as any could remember. ... It was, therefore, all the more shocking when on an ordinary day things first started to go wrong." The change takes the form of Jzero, who comes from nowhere as a slave and eventually confuses everybody with his simple truth.