* You might be mistaken about the title or the year. It's possible the movie is called something slightly different or was released in a different year.
* It might be a lesser-known film. There could be a film called "Music Machine" that was released in 1973, but it wasn't a major release and might not have much information readily available online.
To help you find the movie you're looking for, could you provide any more information?
* Do you remember any other details about the plot or the actors?
* Do you recall any specific scenes or moments from the movie?
* Do you have any information about where you might have seen or heard about the film?
With more details, I might be able to help you identify the film and find its cast list.