Group 1 - The company McDonald's has recently applied to register multiple trademarks for "ba da ba ba ba," covering international classifications including food, catering, accommodation, and kitchen utensils, with the current status being under substantive examination [1] - In 2014, McDonald's previously applied for a "sound trademark BA DA BA BA BA," which included classifications for food, convenience food, and fitness equipment, but the trademark status is currently invalid [1] - The phrase "ba da ba ba ba" is recognized as a classic melody lyric of McDonald's, referred to by fans as the "McDonald's catchy song," and it has recently been reinterpreted by Wang Chuqin [1]