Bartók's Second String Quartet was composed - with several long interruptions - between 1915 and 1918, after he had spent several years almost solely devoted to collecting folk music. The melody and rhythms of the riotous middle movement Allegro, molto capriccioso provide impressive testimony of how his research trips had taken him as far as North Africa. The first edition of this quartet, published in Vienna in 1920, contains a conspicuous number of errors that were only partially corrected in a later revisionundertaken by Bartók. As late as the 1940s he noted changes in his personal copy of the score that have never previously appeared inprint. These late changes by Bartók are taken into account in this definitive edition of the string quartets supervised by Bartók scholar László Somfai, with problematic passages in the sources carefully documented. It is the first-ever Urtext edition of this work. Sensible page turns and cue notes in the parts mean that this edition is ideal for exploring Bartóks sound world in performance.