Iwai (Celebrate)
| Date Composed: | 2001 |
| Composer: | Kiyoshi Nagata |
| Arrangement: | Kiyoshi Nagata |
| Premiere Performance: | August 19, 2002 – Kingston Grand Theatre |
| Recording Title: | Koku CD |
Typically performed as an encore, this song of celebration has a big band feel with its jazzy flute melody and swinging backrhythms.