Tommy Chong
Player Valuation: £70m
Overture to Beethoven's Fidelio - his only opera. Superbly filmed.
Composing opera was never Beethoven's strongest suite, which is why he only ever composed one.
He found the format to be frustrating, and I think it took him years to finish his solo opera attempt.
He stuck to the more complex format, classical music, and left the light, fluffy stuff to the Italians.

Which is why you'll find Italian composers like Verdi doing the complete opposite, composing multi operas, but only piece of real classical music during his lifetime.
Not that I'm taking a sly dig at the Italians, mind you...