Franz Schubert's Piano Sonata, Op. 143 in a Minor was composed in 1823 after his large "Wanderer Fantasy". with its formal cohesion and mature originality, this a-Minor Sonata initiated a new phase in Schubert's sonata oeuvre. The composer dispensed here with all pianistic brilliance. At the same time, a wealth of colour and of sonorities triumphs in such a manner that the work numbers among Schubert's most frequently played sonatas. for this Urtext edition, we had at our disposal the composer's autograph as the authoritative source; the posthumous first edition was consulted only by way of comparison.