Develop a musical composition by integrating the alphabetically represented musical pattern and the supplied melodic theme.
X:1
L:1/4
Q:3/4=100
M:6/4
K:D
['d e', 'a f d']  
X:1
L:1/4
Q:3/4=100
M:6/4
K:D
 a2 g f3/2 e/ d | e c A d3 | d A F D F A | d e f e c e | a2 g f3/2 e/ d | e c A d2 d | 
 e a c B g c | B2 A A3 :: e2 d c3/2 B/ A | d2 c B2 f | g3/2 f/ e e B f | e f ^d e3 | a f d A F A | 
 d e f e c e | a f d e c e | A d c d3 :|  