The highest note ever sung by a human was technically not a musical note but rather a frequency. The record-holder is Georgia Brown from Brazil who hit a G10, according to Guinness World Records. She also has the greatest vocal range, going as low as a G2. The goal as a singer, though, is not to sing the highest note possible or even have the greatest range. The most important thing to focus on, other than hitting the right notes, is to convey emotion as you sing.