Develop a musical composition centered around the provided motif while maintaining the appropriate form.
X:1
L:1/8
M:12/8
K:G
['', 'B3 BAB', 'dBd efg aga'  
X:1
L:1/8
M:12/8
K:G
 A |: B3 BAB G2 B A2 G | B3 BAG A2 B cBA | B3 BAB GAG GBd | g2 e dBG A2 B cBA :| g3 dBd e3 dBd | 
 efg aga bab afd | g3 dBd ede dBd | efg aga bgf g3 :|  