It all started with a simple phone call. When Mathias Heise reached out to Anton Eger with the idea of forming a band, his vision was clear: fresh, high-energy music built on groove, improvisation, and a fearless blending of genres. With the addition of pianist Rasmus Sørensen and bassist Conor Chaplin, THE ACTION 4s was born.

Meeting for the first time on a spring day in 2023, the quartet quickly discovered a natural synergy. Their debut performances that summer were met with resounding acclaim, with Politiken music editor Thomas Michelsen calling them a “supergroup” and awarding their concert at Balders Plads five hearts. Buoyed by their success, the group headed into the studio to record their eponymous debut album.

THE ACTION 4s thrives at the intersection of jazz, rock, funk, fusion, and electronica. Their music is a dynamic interplay of raw energy and masterful artistry, seamlessly blending the acoustic and the electronic. The chromatic harmonica‘s soulful tone meets the rich textures of piano and synthesizer, while the foundation laid by the electric bass and dynamic drumming creates a playful arena for ever-evolving spontaneity. Their compositions pulse with rhythm, melody and interplay, pushing the boundaries of genre and tradition to forge an exciting new direction for Danish jazz.

The quartet brings together four internationally acclaimed musicians, each a master of their craft. Mathias Heise, a virtuoso chromatic harmonica player and accomplished pianist, became a world champion harmonica player at 20 and has since received the Crown Prince Couple’s Stardust Award, the Ben Webster Prize, and recognition from the Danish Arts Foundation. Danish pianist and composer Rasmus Sørensen spent years establishing himself on the New York scene, and is known for his accessible yet innovative sound, earning praise for his debut trio album Traits and follow-up Balancing Act which featured Kendrick Scott. London bassist Conor Chaplin, a sought-after musician with nearly 40 album credits to his name, has performed with Jacob Collier, Jeff Ballard, Ari Hoenig, and Ben Wendel. Completing the lineup is Swedish-Norwegian drummer Anton Eger, a standout figure in European jazz, celebrated for his explosive technique and genre-blending style, earning the Jazz Musician of the Year title at the Danish Music Awards Jazz 2020.