Compose a musical piece using the specified sequence's alphabetical representation and the provided motif.
X:1
L:1/4
Q:1/2=100
M:2/2
K:Gmin
['G A B2', 'd c']  
X:1
L:1/4
Q:1/2=100
M:2/2
K:Gmin
 z G | G ^F G A | B2 B B | A F F F | F2 ^F D | G2 G A | B2 A G | D2 D2 | D2 :: d e | f d B d | 
 f2 e d | c A F A | c2 B c | d d c B | B A G ^F | G2 G2 | G2 :|  