Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/16
M:3/4
K:G
["GBdgbd' bgdBdB GBdgbd'", "GBdgbd' bgdBdB GBdgbd'"]  
X:1
L:1/16
M:3/4
K:G
 z4 | GBdgbd' bgdBdB GBdgbd' | GBdgbd' bgdBdB GBdgbd' | c'd'c'bc'b abagag fgfedc | 
 BGBdgb d'bgdBG Dddddd | GBdgbd' bgdBdB GBdgbd' | GBdgbd' bgdBdB GBdgbd' | 
 c'd'c'bc'b abagag fedcBA | GBdgbd' G4 || z4 | ^ccc eee ggg aaa ^c'c'c' e'e'e' | 
 d'2 aaa fdd ddd fff aaa | gaaaaa eaaaaa ^caaaaa | daaaaa fddddd fff ddd | 
 ^ccc eee ggg aaa ^c'c'c' e'e'e' | d'2 aaa fdd ddd fff aaa | gaaaaa eaaaaa ^caaaaa | dfffff d4 z4 | 
 GBdgbd' bgdBdB GBdgbd' | GBdgbd' bgdBdB GBdgbd' | c'd'c'bc'b abagag fgfedc | 
 BGBdgb d'bgdBG Dddddd | GBdgbd' bgdBdB GBdgbd' | GBdgbd' bgdBdB GBdgbd' | 
 c'd'c'bc'b abagag fedcBA | GBdgbd' G4 z4 |]  