Create a musical composition employing the given alphabetic structure and melodic theme.
X:1
L:1/8
M:4/4
K:C
['F2 ED F>G A2 d3', 'f2 gfed c2 BA d2 e2 f3']  
X:1
L:1/8
M:4/4
K:C
[M:4/4][K:D] (f!p!c._ABC.f)[Q:1/8=100]AG | F2 ED F>G A2 | d3 e f2 z A | B>cdc BAGF | E4 z2 A>G | 
 F2 ED F>G A2 | d3 e/f/ A2 z f | B>cdB c>def | d6 :|"^2" f2 | gfed c2 BA | d2 e2 f3 A | 
 B>cdA BAGF | E6 fg | a/g/f g/f/e fdBG | e6 A2 | B>cdB c>def | d6 :|  