Heavy metal superstars Metallica, a band with a notoriously icy, skeptical view of digital music and streaming, will be releasing their entire back catalogue through the Swedish music platform.

At a press event in New York, Daniel Ek, the founder and CEO Spotify, unveiled tools to help users of the popular global music streaming service discover new music. And he announced a coup for the service: Spotify struck a deal with longtime online music holdout Metallica to make all of the band's music available for streaming.

Metallica, a band that for years fought to keep its music off peer-to-peer sites, has agreed to allow their entire decades-spanning catalog to be freely available on Spotify.

The company made the announcements at a splashy New York event on Thursday that included a conversation between Spotify backer Sean Parker and Metallica drummer Lars Ulrich.

Spotify and Metallica came to an agreement, bringing the metal band’s albums to users of the online music streaming service.

Lars Ulrich, Metallica drummer and famed commando in Internet music wars, was also on hand to announce that Metallica's entire catalog would finally be available on Spotify

Metal gods Metallica have ended their lockout of the streaming music service, adding classic albums like Master of Puppets, Ride the Lightning, and yes, …Justice for All to the site.

The band’s battle with Napster more than a decade ago was legendary, and ironically enough, at today’s announcement event in New York, Metallica drummer Lars Ulrich appeared with Napster co-founder Sean Parker, who now serves on Spotify’s board. It looks like the two one-time adversaries (pictured above at the press conference) have buried the hatchet.

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