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
['E A>Bcd e3 e fdfd ecA>e fdfd', 'B2 c2 B3 A', '|{g} a2 ec']  
X:1
L:1/8
M:2/4
K:A
 E | A>Bcd | e3 e | fdfd | ecA>e | fdfd | ecAd | c2 TB2 | A4 :: B2 c2 | B3 A | B2 c2 | B3 A | 
 BcdB | efed | c2 TB2 A4 ::{g} a2 ec |{g} a2 ec | d2 B>d | c2 A2 |{g} a2 ec |{g} a2 ec | BABc | 
 A4 :|  