Gloria Tang Sze-wing, known professionally as G.E.M. or Tang Tsz-kei, is a Chinese singer-songwriter raised in Hong Kong and originally from Shanghai, China. She made her debut in the Hong Kong music industry in 2008. After releasing three albums in Hong Kong, her appearance in the 2014 edition of Chinese singing competition program I Am a Singer 2 and subsequent 2nd-place finish gained her immense fame and popularity in Greater China.

Mandopop or Mandapop refers to Mandarin popular music. The genre has its origin in the jazz-influenced popular music of 1930s Shanghai known as Shidaiqu; later influences came from Japanese enka, Hong Kong's Cantopop, Taiwan's Hokkien pop, and in particular the Campus Song folk movement of the 1970s. 'Mandopop' may be used as a general term to describe popular songs performed in Mandarin. Though Mandopop predates Cantopop, the English term was coined around 1980 after "Cantopop" became a popular term for describing popular songs in Cantonese. "Mandopop" was used to describe Mandarin-language popular songs of that time, some of which were versions of Cantopop songs sung by the same singers with different lyrics to suit the different rhyme and tonal patterns of Mandarin.