Karlheinz Brandenburg used a CD recording of Suzanne Vega's track "Tom's Diner" to assess and refine the MP3 compression algorithm. This song was picked out as a consequence of its virtually monophonic character and vast spectral information, rendering it much easier to hear imperfections within the compression format throughout playbacks. https://edition.cnn.com/TECH/computing/9902/05/ryko.mp3.idg/index.html