Read this: The song "Tom's Diner" by Suzanne Vega was the first song used by Karlheinz Brandenburg to develop the MP3. Brandenburg adopted the song for testing purposes, listening to it again and again each time refining the scheme, making sure it did not adversely affect the subtlety of Vega's voice.

What particular aspect of the artists voice was he trying to preserve?
What is the answer? (If it cannot be answered, return "unanswerable")
subtlety