Create music using the given musical theme and adhere to the outlined letter-based structure.
X:1
L:1/8
M:3/4
K:G
['BD G2 GB', 'BD G2 GB']  
X:1
L:1/8
M:3/4
K:G
|: B2 | cB Ae dc | BD G2 GB | AD F2 FA | BD G2 GB | cB Ae dc | BD G2 GB | AD F2 FA | G4 :: B2 | 
 AD F2 FD | BD G2 GB | AD c2 cD | BD G2 GB | cB Ae dc | BD GF GB | AD F2 FA | G4 :|  