Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
M:6/8
K:G
['G3 Bcd', 'B2 g dBg BgB dBg']  
X:1
L:1/8
M:6/8
K:G
 BGE DBD | G3 Bcd | c2 A AGA | fed ^cd=c | BGE D2 D | G3 Bcd | cea Bdg | AGF G2 A :: B2 g dBg | 
 BgB dBg | c2 a eca | cac eca | B2 g dBg | BgB dBg | cea Bdg |1 Aag fed :|2 AGF G2 A ||  