The term "WatZatSong" refers to a French music identification and social networking website launched in 2006. The platform allows users to hum, sing, or record snippets of songs they are trying to identify, and the community helps to name these songs. WatZatSong became popular especially in the 2010s for identifying elusive or lost songs and has about 800,000 visits monthly. It serves as a community-driven alternative when algorithm-based music identification apps fail. If you were referring to a song titled "Zat" or something similar, there is no widely recognized song with just "zat" in the title. However, there are songs with titles starting with "Zat" like "Zat You Santa Claus" by Brian Setzer Orchestra and Louis Armstrong. Please clarify if you meant the website WatZatSong or a specific song related to "zat." If you want to identify a song using WatZatSong, it is a platform where you can upload a recording or hum a melody for others to help identify the song. Would you like information on how to use WatZatSong or details about specific songs with "zat" in the title?