Beethoven: Sonata No 9 Op 14 No 1 & Sonata No 10 Op 14 No 2Beethoven only arranged one of his piano sonatas for a different instrumentation: an authentic arrangement of the Sonata op. 14 no. 1 for string quartet still exists (it is published in an appendix to our edition of the String Quartets op. 18, HN 139 9139). He undertook this arrangement to protect himself from those made by others. For this reason he went about it in a meticulous manner; adding, for instance, extremely detailed information regarding