The music heard in Loom is actually taken from Tchaikovsky's ballet «The Swan Lake» — a pretty appropriate choice, considering the part swans have in the game's storyline.
Loom Theme - Act 1 No. 4: Pas de trois: I. Intrada: Allegro
The Elders' Council - Act 4 No. 27: Danses des petits cygnes: Moderato
Crystalgard (The City of Glass) - Act 2 No. 13: Danses des cygnes: IV. Allegro Moderato
The Shepherds / The Dragon Cave - Act 1 No. 6: Pas d'action: Andantino Quasi Moderato
The Blacksmiths' Guild - Act 1 No. 4: Pas de trois: IV. Moderato
The Cathedral - Act 1 No. 4: Pas de trois: II. Andante sostenuto
The Loom (Finale) - Act 2 No. 14: Scene: Moderato