If there's a specific unreleased track you want, fine, pirate that. I don't think there's anything wrong with pirating content that's not available for sale (as long as you buy it if/when it does become available for sale). However, the existence of some unreleased tracks do not give you license to pirate tracks which are released.

Outside of specific, exceptional circumstances, I have zero sympathy for anyone pirating music in 2018. Music is finally being distributed in the DRM Free, affordable, and unencumbered formats consumers have been asking for.