Design a music composition that employs the provided motif and follows the predetermined musical form.
X:1
L:1/8
M:4/4
K:Bmin
['fBBb fBde', 'eAce fBbB'  
X:1
L:1/8
M:4/4
K:Bmin
 fBBb fBde | fBBb eAce | fBBb fBde | fgaf eAce :| fBbB fBde | fBbB eAce | fBbB fBde | fgaf eAce | 
 fBbB fBde | fBbB eAce | fBbB aBgB | fBgB aAce ||  