There are three ways to get it.

First, there are corresponding resources on the Internet itself.

That is, you can download this kind of accompaniment directly. This sounds like nonsense, but in fact, there are generally rich resources for popular or classic songs.

Second, download the audio file of the split-track recording.

This requires the help of arrangement and recording software. For example, CUBASE (and NU, or fruits). If you can download the resource of split-track recording, then open it with software such as CUBASE, and you will see that various instruments are divided into different tracks. Just delete the guitar track and it'll be fine. In fact, this kind of resource is much less than the first one, because the file of split-track recording is quite large, which is not conducive to dissemination on the Internet

Thirdly, if the first two resources cannot be downloaded, then You can only make it yourself.

The method is similar to the second method. You also use software like CUBASE, and then you need to download additional sound sources (such as piano sound sources, drum sound sources). Using this software, you can produce and arrange music by yourself.

The simpler production method is: download the guitar score in GTP format, then export the MIDI, then import the MIDI into CUBASE, and add various sound sources to improve the effect. Such an accompaniment is ready to be produced.

In the above content, things like adding sound sources, exporting MIDI files, or how to make arrangements all fall into the category of computer music production. I cannot explain this in detail. For more details, you can buy a CUBASE tutorial, or search for video tutorials online. I really can’t say this, otherwise I could really publish a book...

If you don’t know CUBASE, it may seem a bit complicated, but in fact the production process is very simple. If you are interested, you can Learn it. And although this method is more troublesome, it is the most widely used. If you want to create your own creations in the future, or want to record audio and video and share them on the Internet, you can rely on this method, which is very fun.

As for the ordinary MP3 or WMA format music on the Internet, it is impossible to directly make it into accompaniment, nor can you buy a CD yourself. There are some software that claim to be able to remove human voices, but in fact they roughly estimate the deletion based on the frequency, which is very inaccurate. It may be that too much is deleted or the deletion is incomplete.

As for using this software to delete guitars, the feasibility is even lower...

Good luck