May 8 (UPI) -- The Beastie Boys' Mike D released his first new song since the pseudo-hiatus of the legendary band 15 years ago, and debuted new music during the first stop of a surprise tour.

The new project, called Mike D 5D, was unveiled late Thursday when the first single, "Switch Up," hit streaming services after he'd played the first show of a four-show tour.

The song and tour follow D, whose real name is Michael Diamond, joining the band Very Nice Person, where he played a couple of Beastie Boys songs a few weeks ago.

The single is the first new music from either D or fellow Beastie Boy Adam "Adrock" Horovitz have released since the death of band mate Adam "MCA" Yauch, who died in May 2012 of cancer.

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