Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/8
M:2/2
K:Gmin
['G,G,B,D GGGG D2 D2']  
X:1
L:1/8
M:2/2
K:Gmin
"Gm" G,G,B,D GGGG |"Cm" EEEC"Gm" D2 D2 |"D7" C2 CA,"Gm" B,B,B,G, |"D7" A,2 DE D2 z2 | 
"Gm" G,G,B,D GGGG |"Cm" EEEC"Gm" D2 D2 |"Eb" B2 BG"D7" AAAF |"Gm" G2 G2 G2 z2 |]: 
"Cm" EEcB [AE]2 [AE]2 |"Gm" DDBA [GD]2 [GD]2 |"Cm" [EC]2 EC"Gm" [DB,]2 DD | 
"D7" D2 [BD][AC]"Gm" [GB,]2 z2 :|  