Sketchbook Quartet is a jazz quartet that formed in 2016 in Berlin, Germany. The group consists of saxophonist Johannes Schleiermacher, pianist Pablo Held, bassist Robert Landfermann, and drummer Jonas Burgwinkel. Their music is characterized by its melodic and atmospheric sound, which draws inspiration from both jazz and classical music. Sketchbook Quartet has released several albums, including "Kekova" (2020), "Diego" (2021), and "When Was the Last Time?, Vol. 1" (2022).