Develop a musical composition by integrating the alphabetically represented musical pattern and the supplied melodic theme.
X:1
L:1/8
M:6/8
K:Dmix
['dAd dAd', "D3 aba fdf aba agf geg c'2"]  
X:1
L:1/8
M:6/8
K:Dmix
|: dAd dAd | dAd fdB | cGc cGc | c'af g2 e | dAd dAd | dAd fdA | F/G/AF GEA | FdD D3 :: aba fdf | 
 aba agf | geg c'2 a | gec efg | aAA ge^c | d3 fdA | F/G/AF GEA | FdD D3 :|  