“The Hitchhiker’s Guide to the Galaxy” had its radio premiere on 8 March 1978. It was later adapted into a series of novels, a TV series, video games and a film. See article in the Economist.
Meanwhile, here is an excerpt that helps explain the significance of the number 42 and why we were so excited to find the Disklavier ENSPIRE PRO unit numbered 42 (thanks to Gérard Assayag for locating the excerpt):
“Good morning,” said Deep Thought at last.
“Er… Good morning, O Deep Thought,” said Loonquawl nervously, “do you have… er, that is…”
“An answer for you?” interrupted Deep Thought majestically. “Yes. I have.”
The two men shivered with expectancy. Their waiting had not been in vain.
“There really is one?” breathed Phouchg.
“There really is one,” confirmed Deep Thought.
“To Everything? To the great Question of Life, the Universe and Everything?”
Both of the men had been trained for this moment, their lives had been a preparation for it, they had been selected at birth as those who would witness the answer, but even so they found themselves gasping and squirming like excited children.
“And you’re ready to give it to us?” urged Loonquawl.
“Now,” said Deep Thought.
They both licked their dry lips.
“Though I don’t think,” added Deep Thought, “that you’re going to like it.”
“Doesn’t matter!” said Phouchg. “We must know it! Now!”
“Now?” inquired Deep Thought.
“Alright,” said the computer and settled into silence again. The two men fidgeted. The tension was unbearable.
“You’re really not going to like it,” observed Deep Thought.
“Alright,” said Deep Thought. “The Answer to the Great Question…”
“Of Life, the Universe and Everything…” said Deep Thought.
“Is…” said Deep Thought, and paused.
“Forty-two,” said Deep Thought, with infinite majesty and calm.
The Hitchiker’s Guide to the Galaxy, Chapter 27