Kinderjazz is a 12 piece big band for young children. It was founded in 1997 by Christobel and David Llewellyn as a way to encourage children with live music. Christobel Llewellyn, sole producer and specialist in music education, has described Kinderjazz's mission as "marinating children in the sound of acoustic instruments playing a wide variety of rhythms, melody, harmony and solos to encourage their spontaneity, develop their creativity and nurture their growing brains in the process". It has performed mainly in New South Wales, specifically Sydney, and has sold out 30 concerts at the Sydney Opera House.

Kinderjazz has produced six albums and was featured on Putumayo's Jazz Playground CD in 2010. The music and lyrics are written by David Llewellyn and have been arranged by a number of musicians, including Arthur Greenslade, Andrew Robertson, Andrew Heading and Bill Motzing. It currently consists of two singers, male and female, two alto saxophones, tenor saxophone, two trumpets, trombone, piano, double bass, drums and congas.

They also operate under the name KJ Allstars with a repertoire for adults.
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