Although Miss Tureck has a wide repertoire, she is best known--as keyboard artist, conductor, and text editor--for her work on Bach; indeed, Mr. Buckley tells us, "Arthur Rubinstein has credited her with the largest single responsibility for the revival of Bach throughout the world." On this radiant show she has with her both a harpsichord and a piano to illustrate her points about how ornamentation was annotated up until the 18th century, how Bach was mistreated in the 19th century, and how different the same piece of music sounds in different tempi. WFB: "Does what you say add up to an excuse not to do the repetitions in the 20th century, which would have fitted the mood of the 18th century?" RT: "Yes, that's an interesting point, because we think of the so-called 'repeats' as repetitions.... A repeat is something quite different from what we think of as repetition. I regard the repeat as a fresh view of the same material."