75980
His output further includes six trio sonatas ( among which previously attributed to Bach ) ; keyboard music , including 24 polonaises , one in each of the major and minor keys ; concertos for harpsichord ; and a set of chorale preludes which has been lost .
 Bach
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Bach