Spokesmanship: PPCW Personal Computer Ad 1999, Titus Watches & Eyewear 1999 Print Ad, ONKYO Audio Systems, Theme Song for Maxwell Coffee "Yi You Wei Jin" 2000, Theme Song for McDonald's China "Wei Xiao De Guang Cai" 2002

Concerts: William So Live in Concert 1998, William So Live in Concert 1999, William So World Tour 1999 in Atlantic City, San Francisco, Los Angeles, Calgary, Toronto, Vancouver, Singapore, Sydney and Melbourne, Andy Hui & William So Live in Malaysia 1999, Andy Hui & William So Live in Australia 2000, William So Live in Singapore 2000, William So Live in Concert 2002, William So Live with Singapore Philharmonic Chamber Orchestra 2003, Andy Hui & William So Live with Hong Kong Sinfonietta 2003, Andy Hui & William So Live in Genting 2005