What Is This? (known prior to 1980 as Anthym) was a rock band that originated in Fairfax High School in California and would play numerous shows along the coast of California. They were formed before and played around the same time as the Red Hot Chili Peppers. Anthony Kiedis of the Red Hot Chili Peppers would introduce the band before they went on stage. Original Chili Peppers members Hillel Slovak and Jack Irons left the Chili Peppers not long before their first album to stay in What Is This?. Hillel rejoined the Chili Peppers for their second album and Jack for their third album.