The medley includes: Girls' Generation's "Gee", "Way to Go", "Into the New World", "Baby Baby", "Girls' Generation", AOA's "Confused", "Like a Cat", "Miniskirt", f(x)'s "NU ABO", "Chu", S.E.S' "Just In Love", "I Love You", "I'm Your Girl", "Just a Feeling", Fin.K.L's "White", "Forever Love", "Blue Rain", SISTAR's "Alone", "Loving U", SECRET's "Magic", "Shy Boy", A Pink's "My My", "Mr. Chu", "No No No", MAMAMOO's "Um Oh Ah Yeh", Red Velvet's "Happiness", EXID's "Up & Down", Wonder Girls' "Be My Baby", Crayon Pop's "Bar Bar Bar", Orange Caramel's "Catallena", KARA's "Rock U", 4minute's "What's Your Name", Brown Eyed Girls' "Abracadabra", and April's own "April Story" and "Tinkerbell".

SEE ALSO: Reunion of 1984-born celebrities in the entertainment industry

Check out the medley above. Can you hear all the songs?