Develop a musical composition centered around the provided motif while maintaining the appropriate form.
X:1
L:1/8
M:4/4
K:Dmix
['A2 AB', 'a2 aa'  
X:1
L:1/8
M:4/4
K:Dmix
|: A2 AB cB A2 | decB cBAG | A2 AB cBAG | A2 D2 DEFG | A2 AB cB A2 | decB cB A2 | agfe dcBc | 
 BAGE D4 :: a2 aa ag f2 | g2 gg gf e2 | f2 ff fe d2 | e2 A2 Aefg | a2 aa agfe | g2 gg gfed |1 
 e2 ee fed^c | d4 defg :|2 agfe dcBc | BAGE D4 ||  