Develop a musical composition incorporating the given motif and maintaining the required musical form.
X:1
L:1/8
M:4/4
K:Bmin
['B2 fB', 'd2 fd c2 ec'  
X:1
L:1/8
M:4/4
K:Bmin
 | B2 fB aBfB | B2 fB ecAc | B2 fB aBfB | fefg aecA | B2 fB aBfB | B2 fB ecAc | B2 fB aBfB | 
 fefg aece || d2 fd c2 ec | defg afge | d2 fd c2 ec | BABc dAGA | d2 fd c2 ec | defg afge | 
 afge fdec | BABc dAGA ||  