Create a musical composition employing the given alphabetic structure and melodic theme.
X:1
L:1/8
M:none
K:D
['AG FE (FE)', 'DE FE (FE)', 'GF GF', 'A2 EF GF GF E{G}A E']  
X:1
L:1/8
M:none
K:D
|: AG FE (FE) (DG) F G2 | AG FE (FE) (D{F}G) D D2 :: DE FE (FE) (DG) F G2 | 
 DE FE (FE) (D{F}G) D D2 ::[K:E]"^Bb instr:" BA GF GF EA G A2 | BA GF GF E{G}A E E2 :: 
 EF GF GF EA G A2 | EF GF GF E{G}A E E2 :|  