Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
M:4/4
K:G
['D D/D/']  
X:1
L:1/8
M:4/4
K:G
 D | DB A G/G/ GB, D D/D/ | FF E/E/ D B3 D | D/D/ BAG/-G/ GB, DD | FG AB | G3 D | 
 D/D/ B(AG) GB, DD | FF ED B3 D | DB A G/G/ GB, D D/D/ | F/F/ GA B G3 ||  