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:G
['d>G (3Bcd g>ba>g', 'G2 (3b^ab b>B^d>f b>ag>f e>^de>f g>^fg>^g a>A^c>e']  
X:1
L:1/8
M:4/4
K:G
|:{A} B>A | G>BD>G [B,B]>D (3GAB | d>G (3Bcd g>ba>g | f>Ae>d c>FB>A | (3GAG A>G F>D (3cBA | 
 G>BD>G [B,B]>DG>B | d>G (3Bcd g>ba>g | f>ed>^c =c>FB>A | (3GAG F>A G2 :: (3b^ab | b>B^d>f b>ag>f | 
 e>^de>f g>^fg>^g | a>A^c>e a>g (3gfe | (3ded ^c>e d2 a>b | c>af>d ^c>de>f | g>^fg>a b2 a>g | 
 f>ed>^c =c>FB>A | (3GAG F>A G2 :|  