Create a musical composition employing the given alphabetic structure and melodic theme.
X:1
L:1/8
Q:1/8=180
M:4/4
K:G
['dG G2', 'g3 a bgaf', 'D2 Bd d2 Bdgd Bdgd BA A2']  
X:1
L:1/8
Q:1/8=180
M:4/4
K:G
 dG G2 dGeG | dBGA BA A2 | dG G2 dedB | AcBA GE D2 |"^5" dG G2 dGeG | dBGA BA A2 | Bd d2 eBdB | 
 AcBA GE D2 ||"^9" g3 a bgaf | gfga bgef | g3 a bgaf | gfed Bdef |"^13" g3 a bgaf | gfga bg e2 | 
 bgaf gedB | AcBA GE D2 ||"^17" Bd d2 Bdgd | Bdgd BA A2 | Bd d2 eBdB | AcBA GE D2 | 
"^21" Bd d2 Bdgd | Bdgd BA A2 | eB B2 e2 dB | AcBA GEDF |"^last time" G8 |]  