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:A
['c2 B2']  
X:1
L:1/8
M:4/4
K:A
 ABcd | e2 e2 fgaf | feed c3 d | e2 e2 fedc | c2 B2 ABcd | e2 e2 fgaf | feed c3 d | e2 e2 fedc | 
 c2 B2 z4 | e3 c d3 B | ce c2 B2 z2 | cBceed c2 | BBccdfed | c2 B2 A2 z2 | e3 c d3 B | 
 ce c2 B2 z2 | cBceed c2 | BBccdfed | c2 B2 A2 z2 |]  