Develop a musical composition by integrating the alphabetically represented musical pattern and the supplied melodic theme.
X:1
L:1/8
M:4/4
K:D
['^G Addc d/e/d Ad fage f2 dc', 'Ad fage fddc Bggf g2 ed |1', 'd3 f f^efg afdf Adfd dccf Ac']  
X:1
L:1/8
M:4/4
K:D
|: ^G | Addc d/e/d Ad | fage f2 dc | Beef geed |1 caed cAA :|2 cage d3 |: f | Aaa^g a2 Ad | 
 fage fddc | Bggf g2 ed |1 cedB c2 A :|2 ca g/f/e d3 |: ^G | Adde fd d/c/d | AdFd dcB_B | 
 Acef geed |1 caed cAA :|2 cage d3 |: f | f^efg afdf | Adfd dccf | Ac d/e/f geed |1 cedB cAA :|2 
 c/B/A ge d3 ||  