Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/8
Q:1/2=80
M:2/2
K:G
['c2 BA Bdef', 'G3 d gdgb b2 ag fafd{e} Td3']  
X:1
L:1/8
Q:1/2=80
M:2/2
K:G
|: D | DGGA B2 AG | FGAB{d} c2 BA | Bdef gdBG | FAGF{F} TE3 D | DGGA{c} B2 AG | FGAB c2 BA | 
 Bdef gbgd | B2 G2 G3 :: d | gdgb b2 ag | fafd{e} Td3 c/B/ | cfac' Bdgb | A2 D2 D3 D | DGGA ABBG | 
 FAcf acBA | BdBG{F} TE3 D | E2 G2 TG3 :|  