Tau is the 19th letter of the Greek alphabet and the name of the Berlin-based fusion quartet consisting of Philipp Gropper (sax), Philip Zoubek (synths), Petter Eldh (bass), Moritz Baumgärtner (drums) and Ludwig Wandinger (electronics). In mathematics, however, Tau also refers to the division ratio in the "golden ratio". Sometimes also called Phi. The letter Tau as a name for the international band is therefore exciting and inspiring in many ways. All four members are internationally successful protagonists of the young European jazz scene. Since their foundation three years ago, TAU 5 have been constantly developing their sound from the fields of jazz, improv, new music and electronics. Based on new forms of composition and improvisation concepts between jam and (re-)edit, TAU 5 researches the specification of a new, collective sound language.