rynniepinnie: Psycho ~ Red Velvet I challenge you to try this riff!!! Been on a kpop kick recently, and this song is definitely on repeat This riff at the beginning of the song is much more challenging than i anticipated 😭 but if you give it a try make sure to tag me! #riff #redvelvet #psycho #kpop #singing #vocals #acapella #AcapellaApp #psychoriff #challenge #psychoriffchallenge