As a songwriter, most of Lau's creative works are as a lyricist. To date, Lau has composed five songs, which include "Missing You Everyday" (天天想你), co-composed with Eric Moo, "If One Day" (如果有一天), "Happiness Is So Far... So Sweet" (幸福.這麼遠.那麼甜), "Spending the Rest Our Lives Together" (餘生一起過), all of which he also sang and wrote the lyrics, and "Brothers" (兄弟), the theme song of his 2004 film, "Jiang Hu", which he wrote the lyrics for but was sung by co-star Chapman To. Most of the songs he has written have been for himself.