A singer namedTim Stormsholds the Guinness record for hitting the lowestnote. It's the musical note G-7, and it registered at 0.189 Hertz. He also holds the record for the widest vocal range, of 10 octaves.
And when you hear him sing the song"Lonesome Road", you'll understand. Check out how low he goes at the 1:59 mark!