> to keep a continuous energy level for hours

Like a full Michael Nyman concert? -

* https://www.youtube.com/watch?v=t3KgZlxTz8g

* https://www.youtube.com/watch?v=FHVU3UlLHRg

Philip Glass's four-hour-long Music in Twelve Parts (1971–1974)?

Disclaimer: I'm a massive fan of the six hour extended cut of Cage's 4'33