Factual error: When Bill and Ted grab Beethoven, we are shown the piano he was playing which is a Steinweg (Steinweg later changed his name to Steinway when he immigrated to the United States). Steinweg made their first piano in 1835, and the model shown was built in Braunschweig so must have been made after 1858, but Beethoven died in 1827, years before a Steinweg piano existed. Also the onscreen graphic says it's 1810. (00:47:50)

Bill & Ted's Excellent Adventure (1989)
Plot summary
Directed by: Stephen Herek
Starring: Keanu Reeves, George Carlin, Alex Winter
Abraham Lincoln: Fourscore and...[looks at his pocket watch]...seven minutes ago... We, your forefathers, were brought forth upon a most excellent adventure conceived by our new friends, Bill...and Ted. These two great gentlemen are dedicated to a proposition which was true in my time, just as it's true today. Be excellent to each other. And... Party on, dudes!
Trivia: Jane Wiedlin, who plays the role of Joan of Arc, was the guitar player of the rock band The Go-Go's.
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Answer: The song is called 'In Time' and it is performed by Robbi Robb.
Alan Sproul