A demonstration recording he mails to record companies is returned to him at least three times, twice marked "address unknown" and on a C.O.D. basis the third time.

It was through Evans' perseverance that demonstration recordings made by the group were presented to The Beatles (Apple's presidents).

In December 1963, at the behest of his manager, Louis Armstrong made a demonstration recording of "Hello, Dolly!"

Both albums were parodies of stereo test and demonstration recordings, which were used by hi-fi enthusiasts to test the performance limits of their audio systems.

"I knew that was coming from a pretty intimate place," he said, adding that he kept choking when he sang the song for a demonstration recording.

"Demo", the original demonstration recording of "Yo Ho."

Although private demonstration recordings of the scores are known to exist, few of the shows had commercial cast albums released.

That same summer, Presley made his first demonstration recordings at Sun.

Bart wrote the score in 1967 and made a demonstration recording, although the musical was not produced until 1969, when it was famously cancelled after just one performance.

As was typical at the time, a demonstration recording of the show's score was recorded by its composer and lyricist/librettist at an early stage in its inception.