His first mature orchestral work, 1894's "Prelude To The Afternoon Of A Faun", was based on a poem by Stephane Mallarme
[DOC] [TLE] Prlude  l'aprs-midi d'un faune - Wikipedia [PAR] Prlude  l'aprs-midi d'un faune (L. 86), known in English as Prelude to the 
Afternoon of a Faun, is a symphonic poem for orchestra by Claude Debussy, 
approximately 10 minutes in duration.