Construct harmonious chords that enhance the provided tune.
f | B2 B f | B/ B3/2 B f | a3/2 f/ e c | A B c7/4 f/4 | f e f/ a3/2 | b3/2 c'/ b a | 
 f e a c | c B B2 || b2 b a | c' b b2 | a2 a f | e c A7/4 f/4 | 
 f e f3/2 a/ | b c' b3/2 a/ | f e a c | c B B2 |]  
X:1
L:1/4
M:4/4
K:Bbmin
 f |"Bbm" B2 B f | B/ B3/2 B f |"Ab" a3/2 f/ e c | A B c7/4 f/4 |"Bbm" f e f/ a3/2 | b3/2 c'/ b a | 
"Ab" f e a c |"Bbm" c B B2 ||"Bbm" b2 b a | c' b b2 |"Ab" a2 a f | e c A7/4 f/4 | 
"Bbm" f e f3/2 a/ | b c' b3/2 a/ |"Ab" f e a c |"Bbm" c B B2 |]  