Sixty years of string quartet writing are summarized in this Diotima's recital, from the first jewels of serialism (an unreleased Barraqué's quartet) to the most recent researches on tone and polyphonic virtuosity by Srnka and Bianchi. At the crossroads of these 'pure writings', Klaus Huber's quartet opens a spiritual area. Beauty does not exist without oversound. Art is commitment.