[...] Have the pianoforte arrangement of The Valkyrie ready [...]; it is possible that we shall soon have it printed. Only—I beg, I implore you—make it easier, and especially easier than The Rhinegold. People are afraid of the latter and I cannot go any further until I have an easier pianoforte arrangement to offer Schott. [...]
Source: Letters of Richard Wagner, Vol. 2, selected and ed. Wilhelm Altmann, trans. M. M. Bozman (J. M. Dent & Sons, 1927), No. 502