First we have IU singing a snippet of 'That's Okay' (D.O.) with her guitar.
Then we have Park Jimin rapping & singing to Simon Says (NCT 127).
And last but not least Suhyun posted her cover of Speechless (Aladdin), which already surpassed 1 mio views.
source: Candy Floss, MBCKpop, mochipeach