Craft a musical composition that incorporates the supplied alphabet sequence and motif.
X:1
L:1/8
M:4/4
K:D
['B3 G']  
X:1
L:1/8
M:4/4
K:D
 B3 G A3 B | G B3 G B3 | d A3 d2 eg | fd=cA AG G2 | B3 G A3 B | G B3 G B3 | d A3 d2 eg | 
 fd=cA AG G2 ||  