Gekkeiju Online™ has a music instrument-system that allows players to freely play different kinds of songs to other players.
To play music, player will first need to get a musical instrument-item and have it wielded. Some of these can be crafted for example by Carpenters.
Once the instrument is wielded in hand, player can go to music-mode from Options-window's Controls-tab. While in the music-mode the keyboard will play notes instead of other actions.
The current music-system supports 3 octaves. Below is the key map for the available notes:
First:
C2 - shift + Q
C2# - shift + 2
D2 - shift + W
E2b - shift + 3
E2 - shift + E
F2 - shift + R
F2# - shift + 5
G2 - shift + T
G2# - shift + 6
A3 - shift + Y
B3b - shift + 7
B3 - shift + U
Second:
C3 - Q
C3# - 2
D3 - W
E3b - 3
E3 - E
F3 - R
F3# - 5
G3 - T
G3# - 6
A4 - Y
B4b - 7
B4 - U
Third:
C4 - A
C4# - Z
D4 - S
E4b - X
E4 - D
F4 - F
F4# - V
G4 - G
G4# - B
A5 - H
B5b - N
B5 - J