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
['DA, A,2 CEGE FG (3Bcd cdfb', 'AFBF AF (3FFF AF (3Bcd', 'z afbf afdg (3fga da fbbf afdA']  
X:1
L:1/8
M:4/4
K:D
 DA, A,2 CEGE | FG (3Bcd cdfb | afdA (3EFG ge | cAGE (3A,B,C FE | DA, A,2 CEGE | FG (3Bcd cdfb | 
 afdf ge (3eee | cAGE D3 z :| AFBF AF (3FFF | AF (3Bcd cfdB | AFBF ABdg | fbaf e2 dB | 
 AFBF AF (3FFF | AF (3Bcd cdfb | afdf ge (3eee | fage d3 z :| afbf afdg | (3fga da fbbf | 
 afdA (3Bcd bg | cdaf e2 AG | FD (3DDD FAge | cA (3AAA GBbg | afdf ge (3eee | fage d3 z :|  