Ch'io mi scordi di te?

"Ch'io mi scordi di te? ... Non temer, amato bene" (Will I forget you? ... Fear not, beloved), K. 505, is a concert aria by Wolfgang Amadeus Mozart for soprano, piano obbligato and orchestra, composed in December 1786 in Vienna; it is often considered to be one of his greatest compositions in this genre.

Earlier in 1786, Mozart had produced a previous (musically unrelated) score based on the same text, as an insertion aria for the character Idamante in a revised version of his 1781 opera Idomeneo, intended for amateur performance in Vienna. For that revival, Mozart reworked the role of Idamante (originally a castrato) for the tenor voice, and the addition of this scena (recitative and rondo "Non più. Tutto ascoltai...Non temer, amato bene", K. 490) was only one of many changes that resulted from this recasting.

The K. 505 setting was written for Nancy Storace, probably for her farewell concert from Vienna on Friday, 23 February 1787 at the Theater am Kärntnertor. Mozart himself very likely played the obbligato piano part (K. 490 has a violin obbligato). The words to the aria are thought to be by Lorenzo Da Ponte. Mozart entered the work on 27 December 1786 into his catalogue with the remark: "for Mlle Storace and me." He performed it again with Josepha Duschek on 12 May 1789 in the Gewandhaussaal in Leipzig on his Berlin journey. Mozart's autograph is dated 26 December 1786.

The work is scored for two clarinets, two bassoons, two horns, strings, soprano, piano.

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