Halcyon (Beautiful Days)

Whose song is Halcyon (Beautiful Days)?

Artist Album
Walking Cloud and Deep Red Sky, Flag Fluttered and the Sun Shine
MONO
2005-03-04: Radio Radio Theatre, Indianapolis, IN, USA
2007-05-16: First Unitarian Church, Philadelphia, PA, USA
2009-04-21: L'Olympic, Nantes, France
Mono
Holy Ground: NYC Live
Holy Ground: NYC Live With The Wordless Music Orchestra
Walking Cloud And Deep Red Sky, Flag Fluttered And The Sun Shine
Walking Clouds And Deep Red Sky, Flag Fluttered And The Sun Shin
walking..
Various Artists
Rock Sound: Music With Attitude, Volume 62