Develop a musical composition by integrating the alphabetically represented musical pattern and the supplied melodic theme.
X:1
L:1/8
Q:1/8=180
M:4/4
K:D
['FA dffe', 'afdf afef dB B2']  
X:1
L:1/8
Q:1/8=180
M:4/4
K:D
 A2 FA dffe | dfef dB B2 | (3ABA FA dffe | dBGE FD D2 :| faab afdf | afef dB B2 | gbbc' bafa | 
 baaf fe e2 | bafg afdf | afef dB B2 | (3ABA FA dffe | dBGE FD D2 :|  