Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/8
M:4/4
K:G
['B2 BA B2 ge', 'f gfed efge agfe dfaf gfed edBd']  
X:1
L:1/8
M:4/4
K:G
 B2 BA B2 ge | d2 ge dBGA | B2 BA B2 ge |1 dBAc BGGA :|2 dBAc BGGG || gfed edBd | gfed e3 f | 
 gfed efge | agfe dfaf | gfed edBd | gfed e3 f | gbag fage | d2 ge dBGA ||  