Compose a piece of music following the specified structure and theme.
X:1
L:1/8
M:6/8
K:G
['D GFGAGA _BG z A3 _B2 c']  
X:1
L:1/8
M:6/8
K:G
 D | GFGAGA | _BG z A3 | _B2 c d2 d/c/ | _BAGAGF | G2 z3 D | GFGAGA | _BG z A3 | _B2 c d2 d/c/ | 
 _BAGFGA | G3 z2 |]  