Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/8
M:6/8
K:G
['G>AG GBG AFD DFD', 'GDG G2', 'cAF (G/A/B/^c/d/e/ f2) d a(ba/g/) f2 d', 'FDE F2 G']  
X:1
L:1/8
M:6/8
K:G
 G>AG GBG | AFD DFD | G>AG G2 B | Add cAF | G>AG GBG | AFD DFD | FDE F2 G | Add cAF || GDG G2 A | 
 FDF F2 A | GDG G2 B | Add cAF | GDG G2 A | FDF FGA | cAG FGA | Add cAF || (G/A/B/^c/d/e/ f2) d | 
 a(ba/g/) f2 d | cAG FGA | Add cAF | (G/A/B/^c/d/e/ f2) d | a(ba/g/) f2 d | cAG FGA | Add cAF || 
 G3 BGG | AGG BGG | G>AG BGG | Add cAF | G>AG BGG | FDE F2 G | FDE F2 G | Add cAF ||  