Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/8
M:4/4
K:D
['F>A B2']  
X:1
L:1/8
M:4/4
K:D
 D>E | F2 d>A B2 Bd | e>d ef A2 A>B | d2 e>d B3 A | F6 F>A | B2 BA D2 EF | A2 F2 E2 F>A | 
 B2 B>A F2 E2 |1 F6 :|2 D6 ||  