Context: 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.

Question: How many of Chopin's works still exist?
Answer: Over 230

Question: All of his pieces include what instrument?
Answer: piano

Question: How many Chopin pieces are known to have survived?
Answer: Over 230

Question: Only a few of Chopin's pieces involve more than the piano, including piano concertos, songs and what?
Answer: chamber music.