Than Tai Den comes from Choi San Dou, the Cantonese song released by Sam Hui in 1978 and performed here under his Vietnamese name Hua Quan Kiet. Written as a Lunar New Year blessing, it quickly became a seasonal standard in Hong Kong and in Chinese and Vietnamese communities abroad. Families still play it at Tet for its wishes of wealth and luck, and short clips now circulate online as a festive sound for greetings, lucky money moments and New Year edits.