Lum Yan Sing is one of the few Singaporean musicians with international performing experience in the erhu, having toured Switzerland, Greece, Norway, Japan, China, Taiwan and Thailand. He is also the first foreigner to be invited by the China Central Chinese Orchestra to present an erhu solo-recital in the Beijing Concert Hall. Not only has he recorded a solo album accompanied by the China Central Chinese Orchestra, he has also conducted the Orchestra in a recording.

In 1995, Lum Yan Sing was invited by the Shanghai Chinese Orchestra to participate in the Shanghai Spring recital and was the orchestral leader for the first part of the performance. In 1997, he led the Singapore Chinese Orchestra's 10-member ensemble to the International Arts Festival in Egypt.

Currently an Assistant Director at NUS Centre For the Arts, NUS, Lum Yan Sing is also the erhu tutor  of the NUS Chinese Orchestra. An active figure in the regional music scene, he sits on the committee of various Chinese orchestra societies in both Singapore and Malaysia. An accomplished and talented erhu player, he is often invited as an adjudicator for instrumental competitions in Singapore.