Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/8
M:4/4
K:D
['', 'F>G^G>A f>dc<d F>G^G>A f>dB>d', 'd>e (3fga ecdB GBEG (3ABA =G>A']  
X:1
L:1/8
M:4/4
K:D
 A<GA/ |: F>G^G>A f>dc<d | F>G^G>A f>dB>d | c>e (3aba ^g>ab>a | ^g>a=g>e c>AG>A | F>G^G>A f>dc<d | 
 F>G^G>A f>dB>d | c>ea>f g<eA>c |1 e>dd>c d>AG>A :|2 e>dd>c d2 (3ded |:[K:A] c>ea>g a>ed>e | 
 c>e (3aag a>ec>A | G>AB>c d>ef>a | (3aag (3agf e<ad>a | c>ea>g a>ed>e | c>e (3aag a>ec>e | 
 d>e (3fga ecdB | GBEG (3ABA =G>A :|"^to finish" c>ea>g a>ed>e | c>e (3aag a>ec>e |1 
 d>e (3fga ecdB | GBEG (3ABA =G>A :|2 d>e f>a e>cd>c | B<EG>B A4 ||  