If you're looking for the best version of the sheet music score, I'd forego the 'standard' sheet-music version and find a copy from the 'Off The Record' series that has ALL of the instruments.
These books are fantastic and are more-or-less authentic transcriptions of what is heard on the record.
'Greatest Hits: Off The Record' includes Bo Rhap.
Slightly Mad 22 - Yes off the record are the correct ones, however they are very hard to get, as there are gone out of print i think.
I found a copy of GH1 and GH2 off the record a few years ago - i don't know where the music shop got them from!
Ok so the closest things to the off the record are from link
They're pretty accurate. You should find Bo Rap there.