Wu was known for his versatile ability to sing and write songs in Hokkien ("Number one in the world", "Back to hometown", "Lonely tree, lonely bird") as well as Taiwanese Mandarin ("Wanderer's love song", "Crying woman"), and also his poetic lyrics. His compositions were also recorded by other artists such as Hong Kong's Jacky Cheung ("If this is not love"), Wakin Chau ("Crying woman"), and Andy Lau ("Number one in the world", "Lone star tear"), and Taiwan's Tarcy Su ("Lazy Man's Diary", "Passive", "Yellow Moon").