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.
A good example is Morphine's The Night. We're not talking about a bootleg record, it's a proper studio album owned by UMG. Yet it's not available on Spotify, Google Music or Amazon Music. It's on iTunes, but that requires installing a native app, which doesn't run on any of my devices, including the most popular OS in the world (Android). Alternatively I can buy a CD, which will cost me something like $50 with shipping, and rip it myself - and that's only because I still happen to own a desktop with a CD drive.
All so that the artists get about $1 from my $10.
Or I can download a torrent and give those $10 to Vapors of Morphine on their Bandcamp page, which is much easier for me and will net them about $8 instead.
So fuck the leeches, I'll keep pirating.
Having easy-accessible piracy channels now works against that goal by incentivizing content providers to invest in more stringent DRM schemes. DRM can rarely prevent piracy completely, of course, but it can make piracy more difficult and less accessible.
But music? There may be corner cases but pretty much any of the big streaming services plus judicious a la carte purchases have you pretty well covered. Personally I do like owning music but then I started from a pretty large collection of physical media.