Design harmonic structures to improve the musical piece.
"^vals" |: AB | c(c f)(f a)f | c4 c2 | dc c2 c2 | c3 AFA | c2 =Bc ed | Ac fa g"^(#)"f | 
 ga bc eg | f4 :|[M:2/4]"^feiar" |: A | d/^c/d/f/ e/^c/A | a/e/f/d/ e/^c/A | 
 F/A/E/A/ D/F/A/d/ | ^c/e/A/c/ d :|"^polka" |: c/B/ | Af ca | cd/c/ B/A/G/F/ | 
 Eg gb/g/ | e/f/g/e/ f :|  
X:1
L:1/8
M:3/4
K:F
"^vals" |: AB |"F" c(c f)(f a)f | c4 c2 |"C7" dc c2 c2 |"F" c3 AFA | c2 =Bc ed | Ac fa g"^(#)"f | 
"C7" ga bc eg |"F" f4 :|[M:2/4]"^feiar" |: A |"Dm" d/^c/d/f/"A7" e/^c/A |"Dm" a/e/f/d/"A7" e/^c/A | 
"Dm" F/A/E/A/ D/F/A/d/ |"A7" ^c/e/A/c/"Dm" d :|"^polka" |: c/B/ |"F" Af ca | cd/c/ B/A/G/F/ | 
"C7" Eg gb/g/ | e/f/g/e/"F" f :|  