“Intro (Delirium)” is a song by English singer, songwriter and producer Ellie Goulding which appears as the introductory track on her third studio album Delirium, which was released on 6 November 2015. It features operatic vocal chops over a dramaticly cinmeatic instrumental made in order to connect ellie’s previous ablum Halcyon to Delirium.

The album itself (Halcyon) featured light, airy and often soprano vocals that help this connection to be deepened.