one-man show

1. Also, one-man band. A person who does or manages just about everything, as in This department is a one-man show—the chairman runs it all, or John conducts the interviews, writes the articles, solicits ads, deals with the printer—he's a one-man band. This idiom alludes to the actor or artist responsible for the entire performance or exhibit, or the musician who plays every instrument in the group. [First half of 1900s]

Example Sentences

The one-man show, Playing Burton, looks at Burton's beginnings in south Wales to his rise as one of the greatest performers of his generation.

From BBC

It’s a one-man show that I can say without hyperbole is the best work he ever did.

From Los Angeles Times

Two days before a shooter armed with an AR-15-style rifle killed an 8-year-old and a 10-year-old, and injured 21 others in a mass shooting at the Church of the Annunciation in Minneapolis, Manuel and Patricia Oliver embarked on a six-day drive from Florida to Los Angeles to take meetings in advance of the West Coast premiere of Manuel’s one-man show, “Guac.”

From Los Angeles Times

Montreux was slightly less so and felt like a “one-man show,” while Lollapalooza and Outside Lands were stimulating.

From Los Angeles Times

The star of HBO TV drama Succession was due to launch his 18-date one-man show - It's All About Me! - on 1 October at the Royal & Derngate Theatre in Northampton.

From BBC