Develop a musical composition that includes the supplied motif while following the designated alphabetical pattern.
X:1
L:1/8
M:4/4
K:A
['a2 fa', 'fAed =g2 fg af=ge fdec Bcdc B=G']  
X:1
L:1/8
M:4/4
K:A
|:"A" a2 fa ecAB | (3(cBA) eA fAeA | a2 fa ecAc |"G" Bcdc B=GGA |"A" a2 fa ecAB | cdef"G" =g2 fg | 
"D" af=ge fdec |"G" Bcdc B=G G2 ::"A" (3(cBA) eA fAeA | (3(cBA) af ecAB | (3(cBA) eA fAec | 
"G" Bcdc B=GB=c |"A" (3(cBA) eA fAed | cdef"G" =g2 fg |"D" af=ge fdec |"G" Bcdc B=G G2 :|  