The Piano Sonata no. 8, K. 310/300d, written in 1778, is a work in three movements. A typical performance takes about 22 minutes. This is the first of only two Mozart piano sonatas to have been composed in a minor key (the other being the K. 457 in C minor). It was written in one of the most tragic times of his life: his mother had just died, and his father blamed him for his wife's death. Mozart was devastated, and poured his constant torment into his sonata, one of the darkest. The last movement in particular has an obsessive, haunted quality about it, heightened near the end by the interruption of the relent drive to the conclusion by repeated and chilling quiet falling passages.