Develop a musical composition by integrating the alphabetically represented musical pattern and the supplied melodic theme.
X:1
L:1/16
M:2/4
K:G
['D2EF G2>A2 BGBd', 'B2G2G2 d2 gfga b2ag fefg a2gf edef']  
X:1
L:1/16
M:2/4
K:G
 D2EF G2>A2 | BGBd cBAG | F2E2D2 EF | G2BG E4 | D2EF G2>A2 | BGBd gfge | dcBA GFGc | B2G2G2 :: d2 | 
 gfga b2ag | fefg a2gf | edef gfed | B2e2 efge | dBGB d2d2 | edef gfge | dcBA GFGc | B2G2 G4 :|  