The Rise and Fall of Ziggy Stardust and the Spiders from Mars
Described as a rock opera and also a loose concept album, The Rise and Fall of Ziggy Stardust and the Spiders from Mars is about Bowie's titular alter ego Ziggy Stardust, a fictional androgynous bisexual rock star who acts as a messenger for extraterrestrial beings.
https://en.wikipedia.org/wiki/The_Rise_and_Fall_of_Ziggy_Stardust_and_the_Spiders_from_Mars