Context: 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.

Question: What was the name of the first song used to develop the MP3?
Answer: Tom's Diner

Question: Who was the artist of the first song used?
Answer: Suzanne Vega

Question: Who adjusted the song?
Answer: Karlheinz Brandenburg

Question: The song was listened to multiple times to try and refine what?
Answer: scheme

Question: What particular aspect of the artists voice was he trying to preserve?
Answer: subtlety