Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
M:3/4
K:G
['BD GB']  
X:1
L:1/8
M:3/4
K:G
"G" DG BD GB |"Am" d2 ce Ac |"D7" DF AD FA |"G" e2 dg Bd | DG BD GB |"Am" d2 ce Ac | 
"D7" DF AD FA |1"G" G,4 z2 :|2"G" G,4 ED |]:"D7" cD Ac Dc |"G" BD GB DB |"D7" AD FA DF | 
"G" GB d2 ed |"D7" cD Ac Dc |"G" BD GB DB |"D7" AD FA DF |1"G" G4 ED :|2"G" G4 z2 |]  