Previously unreleased track alert...

A previously unreleased Bon Iver track has appeared online.

Ticket-holders to the Eaux Claires Music & Arts Festival were recently sent a free cassette by organisers, which contained some new music.

One of the tracks sounded suspiciously like Bon Iver, and Justin Vernon confirmed that this was the case via Twitter.

'Haven, Mass' is a typically meditative work, recorded sometime in 2009, or 2010. Tune in below.

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