Develop a musical composition in line with the given structure and theme.
X:1
L:1/8
M:2/2
K:D
['AB (3=cBA', 'a2 (3agf gbag'  
X:1
L:1/8
M:2/2
K:D
 fg | a2 (3agf gbag | f3 a gfef | dcde (3fed (3edc | dedc AGFG | AB (3=cBA d^cAG | F3 G AB (3=cBA | 
 dcdf ed (3cde | d2 dc d2 :: (3ABc | dcde f3 g | abaf defg | a2 (3agf gbag | fgfe defg | 
 a2 (3agf gbag | fefa gfef | dcde fd (3edc | dedc A2 fg | a2 (3agf gbag | f3 a gfef | 
 dcde fd (3edc | dedc AGFG | AB (3=cBA d^cAG | F3 G AB (3=cBA | dcdf ed (3cde | d2 dc d2 :|  