Develop a musical piece using the given theme and incorporating the letter-based structure provided.
X:1
L:1/16
M:3/4
K:F
['G4 B3 c d4 d2d2 c3 A']  
X:1
L:1/16
M:3/4
K:F
 G4 | B3 c d4 d2d2 | c3 A G4 D2D2 | F3 G A4 A4 | (G3 E) D4 D4 | G3 E D4 C4 | D3 E G4 (G2A2) | 
 (B2e2) d4 (e2d2) | c2A2 G4 ||  