Compose a musical piece based on the given motif and alphabet representation.
X:1
L:1/8
M:2/2
K:G
['D2 G3 G', 'D=FFG F2 FF A=FcF', '', 'BGA=F G2']  
X:1
L:1/8
M:2/2
K:G
 D2 ||"^*" G3 G G2 G2 | BGdd eddd | D=FFG F2 FF | A=FcF dc A2 | DGGA G=FGA | BABc dcde | 
 ^fdec dcAc | BGA=F G2 G2 | DGGA G2 G=F | BGdd (ed)dd | D=FFG F2 FF | A=FcF (dc) A2 | G2 GA G=FGA | 
 BABc dcde | ^fdec (dc)Ac | BGA=F G2 || GA |: ddga g^fga | bgaf gfed | (cA) f2 fefg | afge fedc | 
 daga gfga | bgaf gage | ^fdcB A=FAc |1 BGA=F G2 GD :|2 BGA=F G2 G2 || 
"^Substitution, each repeat of 'A' part""^*" DGGA G=FGA ||  