Perfect Storms (2013)

S8E11 Sweet and Sour Squid

Plankton attempts to win over Squidward in hopes of stealing the Krabby Patty secret formula. Initially, Squidward won't engage with him, but after SpongeBob suggests that Plankton should praise Squidward's music, he takes the advice. This leads to a budding friendship, and the two bond over their love for music, ultimately sharing their tunes with the entire Bikini Bottom community.