The Ritual Fire Dance uses a singer in the ballet transcription.
Original Composition Singing voice (the role of Candelas), flute (piccolo), oboe, horn, cornet, bells, piano, 2 first violins, 2 second violins, 2 violas, 2 cellos and double bass. The Ritual Fire Dance, and the ballet in its whole, has been transcribed many times since its original composition in 1915; often by Manuel de Falla himself. 
