Compose a musical piece using the designated musical pattern's alphabetic representation and the assigned melodic theme.
X:1
L:1/8
M:4/4
K:G
['DFAc B [GB]2 [GB]']  
X:1
L:1/8
M:4/4
K:G
 ef |"G" g2 ga g2 dc |"G" BGAG [GB]2 [GB]2 |"D" AGFE DFAc |"G" B [GB]2 [GB] [GB]2 ef | 
"G" g2 ga gedc |"G" BGAG [GB]2 [GB]2 |"D" AGFE DFAc |"G" B [GB]2 [GB] [GB]2 :| ef |"G" g2 ga gede | 
 gfga b2 be |"D" fefg afaf |"G" gfga"C" gede |"G" g2 ga gede | gfga b2 b2 |"D" d'2 d'2"D7" e f3 | 
"G" g3 a g2 :: GE |"G" DB,DG DB,DG |"C" E [CE]2 [CE] [CE]2 [CE]2 |"D" ABAF DFAc | 
"G" B [GB]2 [GB] [GB]2 GE |"G" DB,DG DB,DG |"C" E [CE]2 [CE] [CE]2 [CE]2 |"D" ABAF DFAc | 
"G" B [GB]2 [GB] [GB]2 :|  