Create a musical composition following the given alphabetical pattern and incorporating the provided motif.
X:1
L:1/4
M:4/4
K:D
['_B A']  
X:1
L:1/4
M:4/4
K:D
 D | A A =F _B | A G =F F/F/ | _B A G =F/F/ | =F/E/ D =C C | =F F G/F/ G | A2 z _B | A D =F E | 
 D2 z |]  