Elysium, in the Blue Sky

Elysium, in the Blue Sky is Disc 1, Track 2 on the Xenoblade2 Original Soundtrack. It plays in the 2nd cutscene of Xenoblade Chronicles 2, when Rex is explaining the structure of Alrest after the King Crustip battle.

The following tracks on the soundtrack are all remixes of this piece:
 * Elysium in the Dream
 * Where We Used To Be
 * Orbital Ring
 * White All Around Us

The piece is broadly split up into 3 sections, each of which contains a melody used as a motif in other tracks on the soundtrack (in addition to the remixes above). The first (12 seconds in) is used in Yggdrasil. The second (36 seconds in) is used in the following tracks:
 * The Decision
 * A Faint Hope
 * The Power of Jin
 * Parting
 * The Tomorrow With You
 * Escape - Going Through Clouds -
 * Elysium
 * One Last You

The third (56 seconds in) is used in the following tracks:
 * Yggdrasil
 * With People and Darkness
 * Our Hope
 * One Last You