Develop a musical composition by integrating the alphabetically represented musical pattern and the supplied melodic theme.
X:1
L:1/8
Q:1/4=90
M:6/8
K:Ab
['A A2']  
X:1
L:1/8
Q:1/4=90
M:6/8
K:Ab
 E2 A A2 B | A3 G3 | A2 c c2 d | (c3 c3) | A2 c e2 c | c3 B3 | (Bc) A G2 F | (E3 E2) z | 
 E2 G B2 d | d3 c3 | c2 c (cA) c | (e3 e3) | f2 f e2 A | d3 c3 | (cB) A A2 G | (A3 A2) z | 
"^Chorus" E2 A A2 B | A3 G3 | A2 c c2 d | (c3 c3) | A2 c c2 e | e3 d3 | (cB) A A2 G | (A3 A2) z |]  