Develop a musical composition utilizing the presented motif and adhering to the required structure.
X:1
L:1/8
M:6/8
K:Amix
['A^ce ed=c BGB dBG', 'a^ga baf'  
X:1
L:1/8
M:6/8
K:Amix
 A^ce ed=c | BGB dBG | A=ce efg | d^cB A2 E | A^ce ed=c | BGB dBG | =cBc efg | d^cB A2 E | 
 A^ce ed=c | BGB dBG | A=ce efg | d^cB AE^G | A^ce ed=c | BGB dBG | =cBc efg | d^cB A2 E |: 
 Aaa{b} a^ga | baf =ged | eaa{b} a^ga | baf g2 d | eaa{b} a^ga | baf =ged | =cBc efg | d^cB A2 E :|  