Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/8
M:3/4
K:C
['G,4 (3EFG', 'C6 c2 e2 (3efg d2 cBAG ABcBAG', '(GF)(FE)(ED) G,4 (3DEF FEED C2 c4 d2']  
X:1
L:1/8
M:3/4
K:C
 C2 (cB)(cB) | c2 BA G2 | AcBAGF | E4 D2 | G,4 (3EFG | GFFEED | G,4 (3EFG | GFFE D2 | c4 d2 | 
 (3edc (3dcB c2 | F2 E2 DB, | C6 :: c2 e2 (3efg | d2 cBAG | ABcBAG | ^F2 EF D2 | D4 (3Bcd | 
 dccBBA | D4 (3ABc | cBBA G2 | AcBAG^F | G2 z GAB | c4 GE | A4 FD | G4 EC | B,2 z DB,G, | 
 G,4 (3EFG | (GF)(FE)(ED) || G,4 (3DEF | FEED C2 | c4 d2 | (3edc (3dcB c2 | F2 E2 DB, | C6 :|  