Beethoven 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 Henle's edition of the String Quartets Op. 18). 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 dynamics and articulation. The acclaimed pianist Murray Perahia, the co-editor for this new edition of Beethoven's Sonatas, also takes this source into account for the revision and in addition provides his own fingerings.