The actor singing “Jolly Green Giant” behind a grand piano in the Taco Bell scene in the movie "Demolition Man" is Dan Cortese.
The 1993 movie Demolition Man tells the story of a police officer who is brought out of suspended animation in prison to pursue an old ultra-violent nemesis who is loose in a non-violent future society.
The movie starred Sylvester Stallone, Wesley Snipes and Sandra Bullock. See full cast and crew at IMDb.
In related news, Sylvester Stallone is suing Warner Bros for fraud, alleging that the studio intentionally concealed profits from the 1993 sci-fi film Demolition Man.
According to the Hollywood Reporter, the actor filed the complaint through his company Rogue Marble productions. The suit alleges “outright and obviously intentional dishonesty” on the part of Warner Bros in its accounting of the film, with the result being that Stallone and Rogue Marble weren’t paid the profits they were owed. Read more of the news at The Guardian.