Boffins at University of Maryland reckon their code successfully manipulated the audio in two songs – Stevie Wonder’s smash hit Signed, Sealed, Delivered that peaked at number 3 in 1970; and Kesha’s infectious track Tik Tok, which topped the chart in 2010 – so that after they were uploaded to YouTube, they avoided detection, and still sounded more or less the same as the originals.
