Develop a musical composition by integrating the alphabetically represented musical pattern and the supplied melodic theme.
X:1
L:1/4
M:4/4
K:A
['A d =c B']  
X:1
L:1/4
M:4/4
K:A
 A/B/ | =c/d/c/B/ A B/c/ | d/e/d/=c/ B d | e e A d | =c B A A | e3/2 d/ e =f | d3/2 =c/ d e | 
 =c3/2 B/ A d | =c B A A | e3/2 d/ e =f | d3/2 =c/ d e | =c3/2 B/ A d | =c B A |]  