Listen to The World's Greatest (Originally Performed By R Kelly) online. The World's Greatest (Originally Performed By R Kelly) is an English language song and is sung by Ringtone Mania. The World's Greatest (Originally Performed By R Kelly), from the album Chart Ringtones #68, was released in the year 2016. The duration of the song is 0:27. Download English songs online from JioSaavn.