Develop a musical composition by integrating the alphabetically represented musical pattern and the supplied melodic theme.
X:1
L:1/16
M:4/4
K:C
['G2GF GABc dBGB AGFD', 'B2BA Bcde', 'd2g2 g2fg abag']  
X:1
L:1/16
M:4/4
K:C
[M:2/4][K:G] .a2b2c2 D2 | G2GF GABc | dBGB AGFD | =F2FE FGAB | cdfe dcBA | G2GF GABc | dBGB AGFD | 
 dfeg fdcA | AG{A}GF G2 || A2 | B2BA Bcde | fdcB AF (3FEF | CF (3FEF AF (3FEF | ABcA BG (3GFG | 
 B2BA Bcde | fdcA dBcA | dfeg fdcA | AG{A}GF G2 || c2 | d2g2 g2fg | abag f2af | d^cde fefg | 
 abag f2fe | d2g2 g2fg | abag f2fe | d^cde fd=cA | AG{A}GF G2 ||  