Develop a musical composition by integrating the alphabetically represented musical pattern and the supplied melodic theme.
X:1
L:1/16
M:2/4
K:D
['BAFA D2(FA) BABd e2(de) faaf', 'faaf egfe']  
X:1
L:1/16
M:2/4
K:D
 (FA) | BAFA D2(FA) | BABd e2(de) | faaf egfe | dfed B2(dB) | BAFA D2(FA) | BABd e2(de) | 
 faaf egfe | d2ddd2 :: (fg) | afdf a2(gf) | gfgab2(ag) | faaf egfe | dfedB2(dB) | BAFAD2(FA) | 
 BABde2(de) | faaf egfe | d2ddd2 :|  