Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
M:9/8
K:G
['gd=f ece dBG', 'd g2 d B2 c d2', 'A2 d G2 d']  
X:1
L:1/8
M:9/8
K:G
 gd=f ece dBG | g2 g gag ^f2 d | gd=f ece dBG | =f2 f fgf e2 d :: g2 d B2 c d2 f | g2 g gag f2 d | 
 g2 d B2 c d2 e | =f2 f fgf e2 d :: B2 d A2 d G2 d | g2 g gag f2 d | Bcd A2 d G2 d | 
 =f2 f fgf e2 d :|  