In late 2013, Hardwell included an unreleased collaboration with fellow big room producers W&W in his live set, which would come to be known by fans as MoS London 2013 ID. The ID was again featured in Hardwell's live sets during his performances at both the 2014 and 2015 Ultra Music Festival, adding to the anticipation surrounding the long unreleased track.

It appears that fans can finally rest easy knowing that the song is due for release later this year, according to a tweet from W&W.

Fan-shot video footage of Hardwell performing the ID at Ushuaia in Ibiza has added another interesting element to the mysterious track, however. It appears that the track now contains a vocal from singer Harrison, who collaborated with Hardwell on"Sally."

The vocalist tweeted "YEAH we GOT This!" yesterday, which matches the vocal line used in the new fan footage of the ID at Ushuaia.

Check it out below:

[H/T: EDMTunes]

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