Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/8
M:2/4
K:A
['', 'ce eA d>e fe ce', 'ec a>e ce']  
X:1
L:1/8
M:2/4
K:A
 A/B/ |: ce eA | d>e fe | ce eA/B/ | cB BA/B/ | ce eA | d>e fe | ce B/c/d/B/ | cA AA/B/ :| B/A/ | 
 a2 a/b/a/f/ | ec a>e | ce a>f | ec BA | a2 a>f | ec a>e | ce B/c/d/B/ | cA AB/A/ | a2 a>f | 
 ec a>e | ce c/e/a/f/ | ec BA | a2 a>f | ec a>e | ce B/c/d/B/ | cA Ae/d/ ||  