Create a musical composition employing the given alphabetic structure and melodic theme.
X:1
L:1/8
M:4/4
K:D
['F>G A>^G A>d', 'e>f e>d c2', 'd4- d>^c d>g B4', 'd>g B4- BA Bd c>B A>B c2']  
X:1
L:1/8
M:4/4
K:D
 F>G | A>^G A>d B>^A B>=g | f>d A4 F>G | A>^G A>d (3fed (3a=gf | e6 F>G | A>^G A>d f>e d>a | 
 g>e B4 e>d | c>g g>c (3A^GA B2 c | d2 f2 d2 :|[K:A] c>d | e2 a2 f2 a2 | e>f e>d c2 e2 | 
 d>e d>c B2 f2 | e>f e>d c2 c>d | e2 a2 f2 a2 | e>f e>d c2 e2 | f>a g>f e>d c>B | A2 a2 a2 :| 
[K:G] z2 | d4- d>^c d>g | B4 B>^A B>d | c>B A>B c2 f2 | e>d G>A B2 d2 | d4- d>^c d>g | 
 B4 B>d ^c>B | A>f e>d ^c>g f>e | d2 d2 d2 z2 || d4- d>d d>g | B4- BA Bd | c>B A>B c2 f2 | 
 e>d G>A B2 d2 | d4- d>^c d<g | e4 e>g f>e | d>^ce>d =c>F B>A | G2 g2 g2 z2 :|  