Dear George
I should have come back sooner, but what with being so involved in the other project and stuff at home I am sorry to say I missed the opportunity to help you sooner.
You were talking to Charles about using my search string to find backing tracks, but without much success. I list below some suggested places to try. How many will be useful I do not know, as I don't know what type of music you are looking for. here goes-:
backing-track.co.uk
backing tracks UK
country music midi files and backing tracks
gigalot
mp3backingtrax.com
miditracks
musical midi
shellshock backing tracks
song galaxy backing tracks
backing trax online
clickmusic
backingtrackmusic.co.uk
qualitybackingtracks
musicbackingtracks
Enboldened listings are companies which I have used and will use again.
I hope these are useful. I would dearly love to be able to repay all your kindnesses.
Best wishes