Develop a musical composition utilizing the presented motif and adhering to the required structure.
X:1
L:1/8
M:3/4
K:Dmin
['a2 ab ga f2 ef dc A2', 'c2 ce gf'  
X:1
L:1/8
M:3/4
K:Dmin
 a2 ab ga | f2 ef dc | A2 Ac de | f2 fg eg | a2 ab ga | f2 ef dc | A2 Ac de | f2 d4 :: c2 ce gf | 
 d2 df e2 | c2 ce gf | d"^\=?"B dc A2 | a2 ab ga | f2 ef dc | A2 Ac de | f2 d4 :|  