Backing Tracks For King Bhumibol's Jazz Compositions?

Hello, I play chromatic harmonica and was looking for music sheets and backing tracks of traditional thai music the other day in Pattaya's music shop near Tesco Lotus, but found nothing (most books they have are with guitar tabs) so I went to Tesco's SE-ED books shop and found one set of DVD+audio CD+music sheet booklet of the King's compositions.

But arrived home I noticed that the DVDs are 1. learn how to play the tunes on keyboard, DVD 2 are the melodies played on keyboard and the audio cd are the tunes played with both melody and backing track.

Now, what I'm looking for are backing tracks of those tunes only with the melody muted, so I can play over with my harmonica.

Do you have any idea where I could find that? My Google skills showed their limit with this search. :-)

Alternatively, do you know where I could buy in Pattaya or Bangkok, well known thai songs written in standard music notation along with a CD with backing tracks?

Cheers,

James