Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/8
M:4/4
K:G
['G4 z2']  
X:1
L:1/8
M:4/4
K:G
 (DG) G2 | G4 G4 | z2 A6 .A6 .A6 .G3/2 G/ | F4 D4 | z2 (DF) F2 | A4 A4 | z d d6 .d6 .d6 .c3/2 c/ | 
 B4 G4 | z2 G2 B2 | d4 d4 | z e e6 .e6 .e6 .d3/2 d/ | (d4 c4) | (d2 c3/2) d/ d3/2 d/ c2 | (B4 G4) | 
 z B B3/2 B/ G2 | G8 | z2 ||  