Develop a musical piece that combines the given theme and letter-structured outline.
X:1
L:1/8
M:4/4
K:G
['BGAF DG G2 ADFA d2 cA BGAF', 'G3 B dggf g2 ag fdde fdcA', 'Bd d2 BGdB', 'B2 GB', '(3Bcd gd']  
X:1
L:1/8
M:4/4
K:G
 A | BGAF DG G2 | ADFA d2 cA | BGAF GBdg | fdcA dBcA | BGAF DG G2 | ADFA d2 cA | BGAF GBdg | 
 fdcA G3 :: B | dggf g2 ag | fdde fdcA | dgga bgag | fdcA G2 (3Bcd | g3 e d2 dc | BG G2 ADFA | 
 GBAc (3Bcd ge | fdcA G3 :: A | Bd d2 BGdB | AGFG ABcA | Bd d2 BGdB | cAFG AGGA | Bd d2 BGdB | 
 AGFG ABcA | GBAc (3Bcd ge | fdcA G3 :: A | B2 GB B2 GB | A2 FA DAFA | B2 GB B2 GB | cAFG AGGA | 
 B2 GB dBGB | A2 FA DAFA | GBAc (3Bcd ge | fdcA G3 :: A | (3Bcd gd (3Bcd gd | Adfd Adfd | 
 (3Bcd gd (3Bcd gd | cAFG AGGA | (3Bcd gd (3Bcd gd | Adfd AdFA | GBAc (3Bcd ge | fdcA G3 :|  