Compose a musical piece using the specified sequence's alphabetical representation and the provided motif.
X:1
L:1/8
Q:1/8=180
M:12/8
K:D
['A2 f', 'G2 B']  
X:1
L:1/8
Q:1/8=180
M:12/8
K:D
 A2 f A2 f A2 f fed | B2 g B2 g B2 g gfe | c2 e A2 A AGA a2 f | gfe cde d3 d3 :| f3 fed e3 gfe | 
 d3 fed c3 cBA | G2 B G2 B F2 A F2 A | E2 F e2 d cBc d3 :|  