Construct chord patterns that blend well with the existing music piece.
(3D=E^F |: G2 G>^F G>A | ^F2- F>D (3D=EF | G2 G>^F G>A | B>A G>^F G>A | 
 B2 B>A B>c | A2- A>c B>A ||1 G2- G>B A>G | G2 ^F2 (3D=EF :|2 
 G2- G>B A>^F | G2- G>A Bc/ || d2- d>B e>d | c2- c>A d>c | B2- B>G c>B | 
 (3BcB A2 D2 | E2- E>F G>E | D>G B- B3/2 d/ z | d>e d>c c>B | B2 A2- A>d | 
 e>d c>B A>G | ^F3 z d>e | d2 A2 c>d | c>B G2- G>A | B2 E2 B>c | 
 B>A ^F2- FG | A>B c>B (3AG^F | G4 ||  
X:1
L:1/8
M:3/4
K:Gmin
 (3D=E^F |:"Gm" G2 G>^F G>A |"D" ^F2- F>D (3D=EF |"Gm" G2 G>^F G>A | B>A G>^F G>A | 
"Bb" B2 B>A B>c |"F" A2- A>c B>A ||1"Eb" G2- G>B A>G |"Dsus4" G2 ^F2 (3D=EF :|2 
"Eb" G2- G>B"D7" A>^F |"Gm" G2- G>A Bc/ ||"Bb" d2- d>B e>d |"F" c2- c>A d>c |"Gm" B2- B>G c>B | 
"D7" (3BcB"D7" A2 D2 |"Eb" E2- E>F G>E |"Gm" D>G B- B3/2 d/ z | d>e d>c c>B |"D7" B2 A2- A>d | 
"Eb" e>d c>B A>G |"D" ^F3 z d>e |"D7" d2 A2 c>d |"Gm" c>B G2- G>A |"Eb" B2 E2 B>c | 
"D" B>A ^F2- FG |"D7" A>B c>B (3AG^F |"Gm" G4 ||  