The vocal queen�Ailee�performed with some other talented vocalists on the November 19 installment of 'Fantastic Duo 2'.

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On the first stage, Ailee was joined by gugudan's Kim Sejeong to perform Ailee's 2016 song "If you." Their harmony is something beautiful to behold.

On the next stage, Ailee and Kim Sejeong were joined by A Pink's Namjoo and Parc Jae Jung as all four artists jammed to Ailee's 2014 hit song "Don't Touch Me." Check out this beautiful rendition below.