Construct a compatible series of chord changes that support the given music piece.
ga |: bfdB edcA | BABc dBFA | BABc dcBd | gfga bagf | bfdB edcA | 
 BABc dB F2 | EFAc dAcA | BB A2 B2 ga :: bfdf bfdf | bfbf gfdf | 
 afcf afce | f=efg afcA | BABc dBFD | EDEF G2 GD | FFAc ecAc |1 
 BB A2 B2 ga :|2 BB A2 B2 ||  
X:1
L:1/8
Q:1/8=400
M:4/4
K:Bb
 ga |:"Bb" bfdB"F" edcA |"Bb" BABc dBFA | BABc"Gm" dcBd |"Eb" gfga"F" bagf |"Bb" bfdB"F" edcA | 
"Bb" BABc dB F2 | EFAc"F" dAcA |"Bb" BB A2 B2 ga ::"Bb" bfdf bfdf |"Bb" bfbf gfdf | 
"Cm" afcf"Gm" afce |"F" f=efg afcA |"Bb" BABc dBFD |"Eb" EDEF G2 GD |"Bb" FFAc"F" ecAc |1 
"Bb" BB A2 B2 ga :|2"Bb" BB A2 B2 ||  