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
['AFFF FEDE', 'A2 AB A F3 ABde fee(e f)edc']  
X:1
L:1/8
M:4/4
K:D
 AFFF FEDE | F3 E FAdB | AFFF FEDE | FABA FE E2 | AFFF FEDE | F3 E FAdB | AFFF FEDE | FAEG FD D2 || 
 A2 AB A F3 | ABde fee(e | f)edc BcdB | ABde fedB | A2 AB A F3 | ABde fee(e | f)edc BcdB | 
 ABde fedB ||  