Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/8
M:6/8
K:G
['gfd Bcd']  
X:1
L:1/8
M:6/8
K:G
"^G3" DGA _B2 G |"C" cBc"D" d2 g |"G" gfd Bcd |"D" cBG"F" =FDC |"^G3" DGA _B2 G |"C" cBc"D" dfa | 
"G" gfd Bcd |"D7" cAF"G" G3 ::"G" g2 d"D" fga |"G" gfd Bcd |"F" c(3d/c/B/c =fef |"D" agf def | 
"^G3" g2 a _bag |"D" fdg fdc |"G" ABG"D" AGF | DGF"G" G3 :|  