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
['F2 DAFA dB', 'dA F2']  
X:1
L:1/8
M:4/4
K:D
 DA F2 DAFA | dB G2 dBGB | DA F2 DAFD | A,E C2 A,ECE | dA F2 dAFA | dB G2 dBGB | AdcB AGFE |1 
 DFAF D2 E2 :|2 (3DFA (3DFA d2 Ec |: dA F2 DAFA | dB G2 DBGB | dA F2 DAFD | A,E C2 A,ECE | 
 dA F2 DAFA | dB G2 DBGB | AdcB AGF |1 DFAF D2 E2 :|2 (3DF A3 DFA d4 ||  