 Complete the following phrase:  Arca and Rosalía have been friends since 2018. Their friendship started when Arca discovered the Spanish singer through her hit single Malamente and saw her set at the Sónar music festival. In April 2019, during an Instagram livestream, Arca teased a song titled KLK and stated I cant wait to put this record out, oh my god. The couple of friends were seen in public again at Frank Oceans PrEP Party in New York City, where the Venezuelan played a special DJ set. In November 2019, Rosalía sampled Arcas voice as an interlude to transition from A Palé to Con Altura during her performance at the 