Grotto is a trio founded in 2022, performing the music of Joonas Leppänen. The ensemble's unusual lineup is quite unique, featuring a combination of clarinet, organ, and drums, which creates a fresh and mysterious sound.

The group explores the concept of an "organ trio" with an open mind, drawing influences from jazz, classical, and folk music. The overall atmosphere of the music could be described as "Nordic introspective, yet with a twinkle in the eye."