Preston Lea "Trey" Spruance III is an American composer, producer, and musician who co-founded the experimental rock band Mr. Bungle. He is also leader of the multi-genre outfit Secret Chiefs 3. Originally a guitarist and trumpeter, in the early 90s Spruance began playing vintage electronic organs, analog synthesizers, saz, santur, electric sitar, tar, and various other string and percussion instruments. In the mid 90s he founded Forking Paths Studio where his production techniques were applied to Mr. Bungle and Secret Chiefs 3 records among many others. Since 2007 Spruance's Secret Chiefs 3 has been a very active live entity, performing well over 500 shows in more than 50 countries.

Mr. Bungle is an American experimental rock band formed in Eureka, California, in 1985. Having gone through many incarnations throughout its career, the band is best known for its experimental rock period. During this time, it developed a highly eclectic style, cycling through several musical genres, often within the course of a single song, including heavy metal, avant-garde jazz, ska, disco, and funk, further enhanced by lead vocalist Mike Patton's versatile singing style. This period also saw the band utilizing unconventional song structures and samples; playing a wide array of instruments; dressing up in masks, jumpsuits, and other costumes; and performing a diverse selection of cover songs during live performances.