Some of these pictures and descriptions may give away plot details that you might not want to know before watching the film.
This is a crazy, campy fictionalized biopic about the composer Franz Liszt directed by outlandish director Ken Russell and starring Roger Daltry, who was a giant rock star at the time. Liszt plays concerts for theaters packed with starstruck mid-19th-century bonnet-wearing teenage girls, hence the film's title. He parties like a rock star, surrounded by famous artists and sex-crazed young female groupies, until his nemesis, the German composer Richard Wagner, steals his wife and forces him to join a monastery to try to atone for his hedonistic life. Wagner is a Hitler figure who's forming a Nazi society with a killer robot and an army of blonde children. The Pope orders Liszt to exorcise the devil from Wagner. Liszt goes to Wagner's castle and tells him "Your work is a creation of the Devil but my music will drive him out." Liszt stands at a piano as Wagner opens doors causing wind to enter and blow him around the room. Finally Wagner grabs the piano which spins around and around until he flies off it. Wagner then picks up a sword and charges at him but Liszt plays a giant chord that makes the piano shoot fire. Wagner screams as we see that the sword in his hand has changed into a snake. He drops the snake and we see it crawling on the floor (and hear rattling sounds, which is wrong because it's a python, not a rattlesnake.) Then Liszt chases Wagner with the fire-shooting piano until he's crushed under some stage props.
According to IMDB comments, one of the director Ken Russell's trademarks is the use of snakes, but he hasn't used them in every movie I've watched that he's directed. He has used them in two other movies on my list - Altered States and The Lair of the White Worm. I need to check out more of his films.