Derivative work in music can be three things:
- An original product that has aspects of someone else's copyrighted work in it. For example: a remix or a translation.
- A derivative work can also be when you decide to record the sample yourself instead of taking a sample from a preexisting track.
- A re-recording of someone else's original work for example: you do a recording of yourself doing someone else's riff instead of sampling the recording of the riff). In the case of derivative work you also need the permission of the copyright holder.
For Derivative work on covers: