generate questions: Over 230 works of Chopin survive; some compositions from early childhood have been lost. All his known works involve the piano, and only a few range beyond solo piano music, as either piano concertos, songs or chamber music.
How many of Chopin's works still exist? {sep_token} All of his pieces include what instrument? {sep_token} How many Chopin pieces are known to have survived? {sep_token} Only a few of Chopin's pieces involve more than the piano, including piano concertos, songs and what? {sep_token}