What is the most popular ringtone in history?

Toccata and Fugue in D Minor [The world's very first ringtone & ringback] (1994) ---50,000,000 downloads of November 13,1999 and counting !!!

Ringtones and Ringbacks were invented and given their precise names when prolific inventor Andre Gray created the world's very first one and uploaded it to his single-webpage on February 5, 1994. For the world's first ringtone, Gray chose the ten second opening of Johann Sebastian Bach's Tocatta and fugue in D Minor. Gray, a music technology specialist from The Juilliard School and inventor of the Electronic Press Kit or EPK among many other inventions, also provided a link to his newsgroup page that told the public how to create their own ringtones. Today, Andre Gray is widely recognized as the absolute father of Ringtones & mobile entertainment in general.