The string quartet is arguably the best formation of classical instrument ensembles ever created. It contains the proper amount of brilliant voices — the rafter-seizing of the first violin, the meaty middle of the second violin and viola and the steady rudder of the cello. Back for their 35th season, the Spokane String Quartet employs this perfect formation to its highest capabilities, showing off the deeper cuts of the quartet repertoire: John Pickard’s “String Quartet No. 5” and Sir Edward Elgar’s “Quartet in E Minor, Op. 83.” Pay no attention to the boring sound of the piece’s titles; they reflect nothing of the magic that will happen on stage when performed.