Easy Piano - Level 1 - Digital Download SKU: A0.1496216 Composed by Rachel Thompson. Contemporary,Contest,Festival. Score. 3 pages. Thompson Piano Studio #1072744. Published by Thompson Piano Studio (A0.1496216). This fun, lively piece is the sound of a trotting horse, Pegasus, that learns to spread his wings and to fly.  September Equinox is part of the Night Sky collection.The star names from the asterism the Great Square of Pegasus are included.