Create a musical composition employing the given alphabetic structure and melodic theme.
X:1
L:1/8
M:2/4
K:Bb
['d/c/ BFDF BBB A/B/ cccc cc z', 'B/A/ GGAB']  
X:1
L:1/8
M:2/4
K:Bb
 d/c/ | BFDF | BBB A/B/ | cccc | cc z B/c/ | dddf | fedc | BBdc | B B2 || B/A/ | GGAB | ccBA | 
 GGAB | c3 B/A/ | GGAB | ccdd | AAGG | F2 f!D.C.! ||  