Develop harmonious chord sequences to enhance the given tune.
"^Cantabile" B, | B, C D E2 G | F D F B3 | d3/2 e/ d c2 B | 
 c d c A G F | B, C D E2 G | F D F B3 | d3/2 e/ d c2 B | 
 c3- c2 :: d/e/ | f2 F B2 A | G2 e c3/2 B/ A | B2 A G2 F | 
 E2 c A3/2 G/ F | d3/2 e/f/g/ e2 d | c3/2 d/e/f/ d2 c | 
 B3/2 c/d/e/ c2 B | B3- B2 :|  
X:1
L:1/4
Q:1/4=120
M:6/4
K:Bb
"^Cantabile" B, |"Bb" B, C D"Eb" E2 G |"Bb" F D F B3 |"Bb" d3/2 e/ d"Eb" c2 B | 
"Cm" c d c"F" A G F |"Bb" B, C D"Eb" E2 G |"Bb" F D F B3 |"Bb" d3/2 e/ d"C7" c2 B | 
"F" c3-"F7" c2 :: d/e/ |"Bb" f2 F"Gm" B2 A |"Eb" G2 e"F" c3/2 B/ A |"Bb" B2 A"Gm" G2 F | 
"Cm" E2 c"F7" A3/2 G/ F |"Bb" d3/2 e/f/g/"Eb" e2 d |"Cm" c3/2 d/e/f/"F7" d2 c | 
"Eb" B3/2 c/d/e/"F7" c2 B |"Bb" B3- B2 :|  