Instrumental music
It should be noted that Instrumental music is a very broad classification. Doing a search will bring up (amonst others) Karaoke, backing tracks and a host of other sub categories.

I was mostly concerned about the needs of some people arriving at my site in search of something other than backing tracks.

To my surprise, once I had set up the shopping cart below with all the products available, I discovered that by typing in a band or Artists name, There were a whole host of unexpectedly delightful results.

Give it a try - you could even end up with Led Zeppelin Karaoke and guitar backings, or some other surprises.
Enjoy.
My Amazon Instrumental Music Store

Instrumental music backing for your originals
Protrax backing tracks also provides a service to songwriters wishing to have backing made for their original compositions.

Having put thousands of hours into recreating both modern and classic hit songs note for note, the team at Protrax are a very capable group of music arrangers, and have also had over 10 years experience providing studio quality instrumental backing for many local artists.

You would have to contact them directly for this. Details are on the Contact page