Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
M:2/4
K:F
['d f']  
X:1
L:1/8
M:2/4
K:F
 d f A e | d4 | G2 f3/2 f/ | g e d c | A c G A | c4 | d f d c | d/ c/ A2 A/ G/ | A3/2 G/ A2 | 
 d f F3/2 G/ | A3/2 G/ A2 | d f c3/2 A/ | G A G F | D F D C | F2 F2 | G A G F | G/ F/ D2 D/ C/ | 
 D E D E | D4 |]  