An English Translation of Traite de Rythme, de Couleur, et d'Ornithologie, volume I, by Olivier Messiaen is a translation of the first volume of Messiaen's important treatise on rhythm, color and ornithology (original French publication by Leduc). Where possible, all musical examples have been reproduced in their entirety. This volume addresses several of Messiaen's ideas on musical as well as non-musical rhythm. Messiaen discusses Time, Rhythm, Greek Metrics, Hindu Rhythms, and analyzes the 39 choruses of Le Printemps by Claude Le Jeune.