Zakk Wylde has spent most of his career playing loud. The guitar work he did for Ozzy Osbourne, starting in 1987, set a standard for sustained aggression that the metal world has been chasing ever since. His band Black Label Society operates in similar territory: riffs that arrive like structural damage, drums that hit with industrial purpose. Subtlety has never been the primary offering.

Then Ozzy died, and Wylde wrote “Ozzy’s Song.”

The track appears on “Engines of Demolition,” Black Label Society’s twelfth album, released March 27. It sits in contrast to everything around it, a ballad that does not perform grief but reports it. Wylde has spoken in interviews about writing the material during and after the Pantera Celebration World Tour, about carrying the weight of what had happened, about what you do when one of the central relationships of your creative life is over. “Ozzy’s Song” is where that processing went.

It is worth sitting with what it means when musicians write about the people who made them. Wylde was 19 when Ozzy hired him, a kid from New Jersey who had been playing in clubs and caught the right person’s attention. The relationship that followed was not just professional. Ozzy had a habit of forming deep bonds with his guitarists, and those bonds often outlasted the employment. Randy Rhoads died in Ozzy’s orbit and the grief never fully left him. Jake E. Lee. Bernie Tormé. And then Wylde, who lasted longest and arguably went deepest.

Music has always been a vehicle for this kind of grief, which is different from grief set to music. When someone has been the context for your entire working life, the way to process the loss is through the work itself. The song is not just about Ozzy. It is about what it means to be a student, a protege, a peer, and eventually a witness to someone’s passing. It is about the specific loneliness of outliving the person who saw your potential before you did.

The rest of “Engines of Demolition” does not pretend this grief erases everything that came before. Tracks like “Lord Humungus” and “The Gallows” deliver exactly what Black Label Society have always delivered, guitar riffs that are architectural in their weight, forward motion without apology. Wylde described the album as “a sincere ride through the peaks and valleys of the last four years” and the sequencing holds to that. The ballad earns its place by being surrounded by the kind of noise that makes silence feel like something.

There is an older tradition here. Heavy music has always had a complicated relationship with tenderness. Black Sabbath wrote “Changes.” Metallica wrote “The Unforgiven.” Tool has entire albums that function as extended elegies. The idea that metal and emotional exposure are incompatible has been wrong from the beginning, but it persists as a cliche because the genre’s loudness is easier to describe than its nuance.

Wylde has never been particularly interested in explaining himself to people who are not paying attention. He makes records for the audience that already knows the language and trusts them to hear what is inside it. “Ozzy’s Song” does not announce itself as a tribute. It does not have a dedication in the liner notes. It is just there, doing what music does when everything else falls short: holding something that cannot be held any other way.

Grief in music does not always resolve. The best of it does not try to. It sits with the loss and offers company. “Ozzy’s Song” is a heavy metal musician telling you that his mentor is gone and that he does not know entirely what to do about that. The honesty is startling. The guitar, when it finally comes back in, does not sound like defiance. It sounds like someone continuing, which is the only answer anyone actually has.