Invent engaging chord sequences that bolster the harmony of the existing music.
A |: FAA AFA | BdB AFE | F3 EDE | FDD D2 A | FAA AFA | BdB AFA | 
 Bcd ecA | ded d2 :: e | f2 f fed | g2 g gfe | f2 f fed | a2 a bag | 
 f2 f fed | gee ecA | Bcd ecA | ded d2 :|  
X:1
L:1/8
Q:1/4=121
M:6/8
K:D
 A |:"D" FAA AFA |"G" BdB"D" AFE | F3"A7" EDE |"D" FDD D2 A | FAA AFA |"G" BdB"D" AFA | 
 Bcd"A7" ecA |"D" ded d2 :: e |"D" f2 f fed |"G" g2 g gfe |"D" f2 f fed |"A7" a2 a bag | 
"D" f2 f fed |"Em" gee"A7" ecA |"G" Bcd"A7" ecA |"D" ded d2 :|  