Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/8
Q:1/8=120
M:2/4
K:G
['B>d BA GB DG FA/F/', 'E>A cA FD']  
X:1
L:1/8
Q:1/8=120
M:2/4
K:G
 B>d BA | GB DG | FA/F/ ED | BD GA | B>d BA | GB DG | FA/F/ EF |1 G2 G>A :|2 G2 G/A/B/c/ |: dB GB | 
 Ac E>A | cA FD | GB d>B | dB GB | Ac E>A | cA FD |1 G2 G>B :|2 G2 G2 ||  