Singer IU recently expressed her thoughts on the public's anticipation of her singing one octave higher. She astounded everyone when she demonstrated that she could deliver up to three octaves for her newest single, "Good Day". During an interview with KBS 2TV's 'Entertainment Relay' on December 18th, IU thanked everyone for their interest, as shown by the various 'Three Octave Booster' parodies. She said, "I'm really thankful. I'm living each day with gratitude." When asked about the possibility of going an octave higher, IU answered, "It's not so much about being able to go an octave higher; it's more about the fact that I'd have to sing for longer on a single breath that makes it hard. I can only go up to three octaves." The singer also shared essential know-hows on how to sing her three octave hit. "After breathing in as much as you can, you burst it out with a 'Boom'." Source: TV Daily via Nate