Help identifying a song at the beginning of episode 1 of Your Lie in April
This is track #1 from disc #1 of the OST, titled "Kimi wa Wasurerareru no" (translates as "Could you forget?", which Kaori says to Kousei multiple times over the course of the show). Here is a 20-second extract from the beginning of the piece: https://clyp.it/2mfjovz4.