Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/8
Q:1/4=120
M:4/4
K:A
['a2 eg a2', 'ceAe ceAe ceag fedc']  
X:1
L:1/8
Q:1/4=120
M:4/4
K:A
"^Reel." g | a2 eg a2 eg | a2 (ea) fedc | dfBf dfBf | dfba gfeg | a2 ea (ga)ea | gaea fedc | 
 defd ecBA | E2 G2 A2 |] e2 | ceAe ceAe | ceag fedc | dfBf dfBf | dfba gfed | ceAe ceAe | 
 ceag fedc | defd ecBA | E2 G2 A2 |]  