Suzanne has been referred to as the "Mother of the MP3" as it was her voice that was used as the model for Karlheinz Brandenburg's compression algorithm. From Business 2.0 Magazine:
"To create MP3, Brandenburg had to appreciate how the human ear perceives sound. A key assist in this effort came from folk singer Suzanne Vega. I was ready to fine-tune my compression algorithm, Brandenburg recalls. Somewhere down the corridor a radio was playing [Vega s song] Tom s Diner. I was electrified. I knew it would be nearly impossible to compress this warm a capella voice.
Site also has quite a few sample MP3s.