Develop a musical piece using the given theme and incorporating the letter-based structure provided.
X:1
L:1/8
M:4/4
K:F
['c<FA>F D>FC>F B,>DA,>F', 'a>ff>c d<fc>A']  
X:1
L:1/8
M:4/4
K:F
|: d | c<FA>F D>FC>F | B,>DA,>F G<G,G,>d | c<FA>F D>FC>A | B>G A/B/c/B/ A<FF>d | c<FA>F D>FC>F | 
 B,>DA,>F G<G,G,>B | A<FA>c B/c/d/B/ c>B | A<FG>E (F2 F) || g | a>ff>c d<fc>A | B>dA>c d<GG>f | 
 a>ff>c d<fd>B | A<FG>E (F2 F>)f | a>ff>c d<fc>A | (3BdB (3AcA G>gg>b | a<fg<e f<cd<B | 
 A<F{A}G>E [A,F]2 [A,F] ||  