Develop a musical composition by integrating the alphabetically represented musical pattern and the supplied melodic theme.
X:1
L:1/4
M:6/4
K:D
['d d2 d a2 a f3/2 e/', 'd e']  
X:1
L:1/4
M:6/4
K:D
 d | d2 d a2 a | f3/2 e/ f d3/2 e/ d | e f e a3/2 b/a/g/ | f3 e2 :: d | d2 d a2 a | 
 f3/2 e/ f d e f | g3/2 a/ g f3/2 e/ f | e d e A B c | d e f (g/ f) (e/ d) | e2 A d e f | 
 (g/ f) (e/ d) e3 | d2 |]  