As an example: If you enter "Charlie Parker Barbados" in the entry field it shows various Dixieland styles :-) for this classic 60s bebop tune. The reason seems to be the wrong decade entry "1940" for this song.
It would be fine, to have the possibility to easily edit such mistakes in the local installation or report them to PGMusic for patches.

Not sure where that data is, I searched through all the files in bb\Data for Barbados. It might be in a .bin file ??

Title=Barbados
Artist(s)=Charlie Parker
Writer(s)=Charlie Parker
Genre=Jazz
SubGenre=Bebop
KeyWord=\alts
TimeSig=4 =4/4, Key=F ,Sw 8 ,tempo=160,year=1940
Chords per song =6, # beats/Chord Change=3

I searched the files in \bb and all subdirectories. I think, it is a compressed data base file and not easily editable. The developers should have information on this.