While most of the tracks are taken from previously released albums, this set also contains a large number of rarities.

"Labour of Love", "Ocean", "Orion", and "Threshold" were recorded for the John Peel Show in 1983.

In 1984, a follow-up Peel Session produced the version of "Carnival of Light" contained in this set.

"Bylar", a Lisa Gerrard and Robert Perry (Brendan's brother) composition, was taken from a live performance recorded on 10 July 1996 at the Keswick Theatre in Glenside, Pennsylvania for the Echoes public radio show.

"The Lotus Eaters" is a previously unreleased track, from the sessions for the band's aborted eighth album.