Develop a musical composition in line with the given structure and theme.
X:1
L:1/8
Q:1/4=120
M:2/2
K:G
['', 'GDEG DEGA', '', 'BGGe ggdg edBA Ba{b}ag aaef ggdg edBc'  
X:1
L:1/8
Q:1/4=120
M:2/2
K:G
"^Fast" (3DEF |: GDEG DEGA | BAGB AGEF | GDEG DEGA |1 BdAF G2 DF :|2 BdAF G2 || g2 |: ggdg edBc | 
 ddAc BGGe | ggdg edBA | Ba{b}ag aaef | ggdg edBc | (d/e/d)Ac BGGe | (g/a/g/f/)gd Bgdc | 
 BGAF G2 Bd :|  