Develop a musical composition by integrating the alphabetically represented musical pattern and the supplied melodic theme.
X:1
L:1/4
M:3/4
K:D
['D E F', 'B G B']  
X:1
L:1/4
M:3/4
K:D
"A" | D E |"D" F B A |"A7" F D E |"D" F D2 | z D E | F G A |"G" B c B |"A7" E3 | z D E |"D" F B A | 
"A7" F D E |"D" F D2 | z D E |"Bm" F B A |"A7" E G F |"D" D3 | z"B" || D E |"Bm" F B c | d c B | 
"F7" B ^A2 | z ^A A |"Bm" B B c |"Em" d e =f |"F7" ^f3 | z"^(A7)" F E |"D" D F A | d d c | 
"G" c B2 | z F G |"A7" A B A | G F E |"D" D3 | z3"C" |:"D" F3 |"A7" E D E |"D" D3- | D3 |"G" d3 | 
 B G B |"D" A3- | A3"^I" |"G" d B d |"F#m" c A c |"Em" B G B |"D" A3 |"D" F3 |"A7" E D E |"D" D3 | 
 z :| z3 |]  