Legal Question in Entertainment Law in California

Re: Song Sampling

It the use plays a role in deriving monetary gain, then you technically need a grant of permission to use the instrumental.

Re: Song Sampling

It's not clear exactly what you're proposing to do. If you copy any substantial portion of the original work, you must obtain a license. The nature of your use is largely irrelevant.

"Sampling" more often refers to use of a very short segment from a prior work, as a "quote" or reference in a new work. even in such situations, licenses must be obtained.

Note also, that you've got TWO licenses you'll need. The Musical composition (the songwriter's contribution) is controlled by the music publisher, while the recorded performance (the artist's contribution) is controlled by the record label.