Compose a musical piece by integrating the alphabetic representation of the specified sequence and the provided motif.
X:1
L:1/8
M:4/4
K:G
['B2 BA G4']  
X:1
L:1/8
M:4/4
K:G
 B2 BA G4 | d2 eB d4 | B2 BA G4 | A3/2 A/ A3/2 B/ A4 | B4 A G3 | d4 c B3 | e2 e2 d2 GA | 
 B B2 B A2 GA | B B2 G A2 A2 | G4 z4 |]  