Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/8
Q:1/8=80
M:4/4
K:Amin
['A AEAB cded cABc A3 B cde^f', 'z A GGcd eAAA EAcB A3 A']  
X:1
L:1/8
Q:1/8=80
M:4/4
K:Amin
"^slow" A | AEAB cded | cABc A3 B | cde^f ^gaea | c'ab>a a3 b | c'c'ba beed | cgBA G3 A/B/ | 
 caag efde | cAB>A A2 z || A | GGcd eAAA | EAcB A3 A | G2 B>c dgdc | BAE^F G3 G | A2 c>B A3 E | 
 c2 d>e d3 d | eaae fded | c2 B>A A4 |]  