The long-running quartet of percussionist Heinz Geisser, bassist Fridolin Blumer, pianist Reto Staub and trombonist Robert Morgenthaler have for years extended their 4-tet with a 5th guest, here asking vibraphonist Christopher Dell to join them in the studio after a successful live performance in the spring of 2022, capturing this spectacular, wide-ranging example of collective improvisation.