Develop a musical composition in line with the given structure and theme.
X:1
L:1/8
Q:3/8=90
M:6/8
K:A
['aga edc def', 'def edc'  
X:1
L:1/8
Q:3/8=90
M:6/8
K:A
 aga edc | def Bcd | cBc FGA | GFG E3 | aga edc | def edc | dcB ABG | A3 A,3 :: Ace =gfg | 
 fed def | edc dFB | G3 E3 | aga edc | def edc | dcB EAG | A3 A,3 :|  