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:A
['dB [ee] B2']  
X:1
L:1/8
M:4/4
K:A
 B |"A" A2 EC (EF)AE |"A"{E} [AA] EA"E" FBBc |"A" A2 aA"D" fAeA |"E" GBEd"A" cAA | | g | 
"A"{ab} a2 ec"Bm"{e} f2 dB |"A"{B} [ee] cA"E" B2 GB |"A" a2 ea"D"{ef} f2 df |"E" ecdB"A" cAAg | 
"A" a/a/a ec"Bm" f/f/f dB |"A"{B} [ee] cA"E"{Bc} B2 GE |"D" FABA"E" GBed |"E" ceBd"A" cAA |]  