Only once in Chopin's music is there a direct reference to Bach, and that is, appropriately, at the beginning of his only educational work, the two s… - Charles Rosen

Mathematicians tells us that it is easy to invent mathematical theorems which are true, but that it is hard to find interesting ones. In analyzing music or writing its history, we meet the same difficulty, and it is compounded by another. For whom is it interesting? To paraphrase a famous remark of Barnett Newman, musicology is for musicians what ornithology is for the birds.

Mendelssohn was the greatest child prodigy the history of Western music has ever known. Not even Mozart or Chopin before the age of nineteen could equal the mastery that Mendelssohn already possessed when he was only sixteen. Most astonishing is the nature of Mendelssohn's precocious talent: not only a gift for lyrical melodic lines and delicate, transparent textures, but, above all, a control of large-scale structure unsurpassed by any composer of his generation.

Sonata form could not be defined until it was dead. Czerny claimed with pride around 1840 that he was the first to describe it, but then it was already part of history.