Would this be the track? N.I.B. is from the self title release by Sabbath and is usually worked in with Wasp/Behind The Wall of Sleep/Bassically/N.I.B. all as one track but four different music pieces together, on the original release. At least from the U.S. and Canadian release of Sabbath's self titled release, various versions of the self titled Sabbath release exists with slightly different track listings from different music markets. I just did a region lookup for this release with that track on it, which music region are you currently in? As I only have access to the U.S. release with this track on it other release versions from different listening regions on the Spotify service have the different altered track listings greyed out for me. As the European release of the Sabbath self titled release usually contains an extra track Evil Woman not released officially on the U.S. and Canadian released version of the Sabbath self titled release.
I came across two different releases from the Spotify listening regions when doing a look up for this release.
This release of We Sold Our Soul For Rock 'N' Roll for the U.S. and CA users:
And this release of the same title but with a slighlty altered title track listing for these listening regions on the Spotify service ARAUATBEBOBRBGCLCOCRCYCZ DKDODEECEESVFIFRGRGTHNHK HUISIEITLVLTLUMYMTMXNLNZNI NOPAPYPEPHPLPTSGSKESSECH TWTRUYGBADLIMCID:
Is the single N.I.B. from this release above greyed out for you currently?