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:C
['', 'e2 dB', 'G2 GA B2']  
X:1
L:1/8
M:4/4
K:C
"^Air\n\n[Q:"S |][K:G] de | =f>e fg fedc | B2{B} A>G G2 de | =f>efg fedB | d2 eg g3 g | 
 =f2 fg{f} e2 dB | B2 AG G2 GA/B/ | c2 =f2 e2 dB | A2 GG G2 || d>c | B2 A2 G2 G>A | 
 B2{B} AG G2 GA | B2 =fe d2 cB | c2 de =f2 dc | BB AA G2 GA | B2 de/f/ g2 d>c | B3 G A3 G | 
 G4 G2 ||  