Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/4
M:3/4
K:F
['F A']  
X:1
L:1/4
M:3/4
K:F
 C | F2 F | A F A | c2 c | c A F | c2 F | F A c | c3/2 A/ F | A2 c | G A G | F G A | G z F | 
 F A c | c3/2 A/ F | A2 c | G A G | F2 |]  