Create music using the given musical theme and adhere to the outlined letter-based structure.
X:1
L:1/8
M:4/4
K:G
['G3 A Bdef gfge dBAG F2 AA', 'b2 bg a2 af', 'BG E2 AA ABAG EAAB ABcd e2']  
X:1
L:1/8
M:4/4
K:G
 G3 A Bdef | gfge dBAG | F2 AA ABAG | FAAB AcBA | GFGA Bdef | gdeB dBAG | EGFA G2 D2 | EGFA G4 || 
 b2 bg a2 af | gfge d4 | e2 aa abag | eaab a2 ga | b2 bg a2 af | gege d2 Bd | e2 f2 g2 d2 |1 
 egfa g2 gb :|2 egfa g2 fg || e2 ec d2 dB | c2 cA B2 BG | E2 AA ABAG | EAAB ABcd | e2 ec d2 dB | 
 c2 cA B2 BG | EGFA G2 D2 | EDEF GDB,G, ||  