[5] He is often invited as a featured artist at major events around the world including: a concert initiated by United Nations Secretary General Ban Ki-moon at the United Nations General Assembly Hall, alongside Maestro Lu Jia, composer Tan Dun, and coloratura soprano Sumi Jo; Phoenix Television's global live broadcast concert with the China Symphony Orchestra at the Beijing National Center for Performing Arts; and both Beethoven Orchestra Bonn's inaugural tour to China under Maestro Stefan Blunier and Detroit Symphony Orchestra’s first China tour under Leonard Slatkin.

[6] Lee gave the world premiere in October 2012 of Bright Sheng's latest cello concerto inspired by Dunhuang, one of China's cultural treasures.

In 2014, he was invited for the launch of the IMAGINE Project at the UN General Assembly Hall with Yoko Ono, Hugh Jackman and ABBA’s Bjorn Ulvaeus to commemorate the 25th anniversary of the United Nations Convention on the Rights of the Child.

[7] Lee also performed in a fundraising concert for well-known anti-apartheid and human rights activist Denis Goldberg and his House of Hope Foundation in South Africa.

[9] Lee also appeared on a Phoenix Television global live broadcast concert with the China Symphony Orchestra at the Beijing National Center for Performing Arts.