Using instrument from newer Minecraft versions

As clients with version 1.11 and less doesn't contains 1.12 sounds and 1.13 and less doesn't contains 1.14 sounds you have to use resource pack.

Option 1 - Upload resource pack to cloud storage and edit server.properties

Download resource pack and upload it to your cloud storage (e.g. Dropbox). Now edit your server.properties like this:

resource-pack=https\://<dropbox url>?dl=1

Option 2 - Use Github repository as cloud storage and edit server.properties

You can use this repository as source of resource pack. Edit your server.properties like this:

resource-pack=https\://github.com/koca2000/NoteBlockAPI/raw/master/Instruments.zip