THE SINGER NOT THE SONG (1961) Dirk Bogarde - YouTube
https://www.youtube.com/watch?v=hsh_IqEC7mYSaw this on TV some time in the 1690s, I can't have been much more than 12; remembered it the other day, and there it was [albeit in a horrible lo-res version] on the Tube. Bogarde later described his performance as 'a love affair with myself...nobody in that whole bloody organisation had a clue what I was up to!' - but he neglected to credit the black leather pants he wore as the bandit Anacleto, which really should have had their own agent.
It now reads as a tour-de-force of menacing camp [though of course I couldn't see this as a child, and just thought Bogarde's thoughtful, intelligent baddie rather cool], but apparently the critics of the day spotted this, and Bogarde's then-legions of fangirls too; it flopped as box-office, but has since [apparently] gained cult status. Well worth a look, I think, despite the obtrusive music score.
"To learn who rules over you, simply find out who you are not allowed to criticize" - Voltaire