Sigh Enlists Opeth’s Mikael Åkerfeldt for New Track “Unputenpu”

Three and a half decades in, Sigh remains allergic to stasis. The Japanese band, formed in 1989, has spent its career bending black metal’s initial blueprint into something stranger and more theatrical. Their latest move adds a notable guest: Opeth’s Mikael Åkerfeldt appears on “Unputenpu,” a new track that surfaces after a period of relative quiet from the group.

The collaboration makes a certain crooked sense. Both acts have spent years sidestepping genre expectations, and Åkerfeldt’s clean delivery fits naturally into Sigh’s dense, prog-adjacent landscapes. The track itself is not a straightforward metal cut—true to form, it twists through shifts in tone and texture, balancing melodrama with the band’s enduring interest in controlled chaos.

Sigh’s music has long thrived on a kind of productive recklessness, absorbing whatever influences serve the moment without losing its core identity. “Unputenpu” continues that pattern. The appearance of Åkerfeldt—arriving not as a spotlight-stealing guest but as a textured addition—suggests an artist still invested in serving the song, not the billing.

Details on a larger release remain unconfirmed, but the track arrives as a reminder that Sigh operates on its own clock. In an era of constant album cycles, a single track with this much intent feels like a small event.