Past Is Prologue is the debut studio album by the American ambient music project Tycho.

It was originally released under the title Sunrise Projector in 2004, before being re-released by Merck Records in 2006 (and 2007 as an EP sampler), and reissued by Ghostly International in 2010.

The album title is a reference to a famous line from Shakespeare's The Tempest.

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