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
['F2 D F G2 G2 c2 G']  
X:1
L:1/8
M:2/4
K:F
 F2 D F | G2 G2 | c2 G c | F D C2 | c f d c | B2 B c | G F E C | F4 |]  