Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
Q:1/2=75
M:2/2
K:Gmin
['(3bag ^fg d3 e d2 (3cBA BA', 'B4 (3dcB Bcde f2 (3cBA ABcd (3bag', 'G4 ecgc ac=Bc']  
X:1
L:1/8
Q:1/2=75
M:2/2
K:Gmin
 (3bag ^fg d3 e | d2 (3cBA BA G2 | (3dcB- Bc dB fd | d2 c2 B4 :| (3dcB Bcde f2 | 
 (3cBA ABcd e2"^:S:" | (3bag ^fg (3ecd- dg | B2 A2 G4 :| ecgc | ac=Bc | dgd=B | c_bag"^D.C." :|  