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Electron neutrino has been the first neutral lepton to be foreseen anddiscovered last century. The un-ordered muon and its neutrino arose later bycosmic rays. The tau discover, the heaviest, the most unstable charged lepton,was found surprisingly on 1975. Its neutrino was hardly revealed just on 2000.So why High Energy Neutrino Astronomy should rise first via tau neutrino, thelast, the most rare one? The reasons are based on a chain of three favorablecoincidences found last decade: the neutrino masses and their flavor mixing,the UHECR opacity on Cosmic Black Body (GZK cut off on BBR), the amplified tauair-shower decaying in flight. Indeed guaranteed UHE GZK tau neutrinos, feed bymuon mixing, while skimming the Earth might lead to boosted UHE tau, mostlyhorizontal ones. These UHE lepton decay in flight are spread, amplified, noisefree Air-Shower: a huge event for an unique particle. To be observed soon:within Auger sky, in present decade. Its discover may sign of the first tauappearance.

Why Tau First?