At the
Ministry of Education (MOE), Khoo and David Lim started the Combined Schools Choir, which was later renamed the
Singapore Youth Choir (SYC), in 1964. Lim took control of the SYC in 1968. They also initiated the school band movement and designed the band curriculum for MOE. In 1969, Lim was promoted to head the Music Department in MOE. The number of school bands grew from 4 to 150 within a short period. He pioneered the instrumental teaching programme in primary schools which encouraged the use of instruments in the teaching and learning of music. In 1975, Lim formed the
Four Voices vocal quartet with
Yeoh Siew Lian, Shirley Fleury, and Geoffrey Abisheganaden. Lim was responsible for the formation and training of many junior college choirs. Many are led by former members of the SYC. He retired from MOE in 1996. == Honours ==