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:D
['d2 d c2 d', 'f2 f fdf']  
X:1
L:1/8
M:6/8
K:D
 d2 d c2 d | efe efg | d2 d c2 d | ecA A2 A | d2 d c2 d | efd efg | agd gec | d2 d d3 || f2 f fdf | 
 g2 g geg | f2 f fdf | ecA A2 g | faf def | gbg efg | agd bec | d2 d d2 |]  