Develop a musical composition by integrating the alphabetically represented musical pattern and the supplied melodic theme.
X:1
L:1/4
Q:3/4=90
M:3/2
K:Amin
['A2 E c B A G E2', 'B c']  
X:1
L:1/4
Q:3/4=90
M:3/2
K:Amin
 A2 E c B A | G E2 D C B, | A, A2 B c d | e A c B/A/ ^G E | A2 E c B A | G E2 D C B, | 
 C E D F E e | ^G E2 G A2 :: e2 c g f e | d B c (B/A/) G E | A G A B c d | e d/c/(B/c/) (d/B/) c2 | 
 e2 d2 f2 | e2 a2 ^g2 | e2 A B/c/(d/c/)(B/A/) | ^G E2 G A2 :|  