Sometimes people like to discuss things too much, instead of just listening and enjoying. Some time ago, there was an expression "sewing machine Bach". This was used to describe the absolutely metronymic and boring baroque playing. I think the expression was made up by Sol Babitz. Perhaps you can search that. JS Bach left no written directions about the interpretation of his music. But we have have Leopold Mozart's book, along with Quantz and CPE Bach. （泪奔啊。这三本书都是我们上课用的啊。）It is especially the opening Adagio that needs to be free. It is not a rigid dance, but an exploration. We will never know exactly how Bach played.
She（Wallsich--ｐｉｙ注） is a true artist. And that gives access to a different understanding of music than from the level of rules and knowledge of traditions etc.。（piy注，有一次Lambert Orkis给我上课，某个莫扎特作品。他问我，这个地方为什么弹非连音。我说，detaching是当时默认的弹法。Turk的书上说过。他很不屑地看着我说，这就好像时兴的衣服和款式。莫扎特是何许人也？不是俗人啊！）The tempo discussion is an important one, but should not disguise that there is something more important in music: the undersatanding of it and the ability to render the musical speech, rethoric thru deep knowledge and emotion. I think it is a passed station that Bach;s music should be played in strict tempo. Of course I don't deny the need of strict tempo. But I think it should be appied on a different scale. Not note by note. But, say mesure by mesure, or even larger: two mesures by two mesures. Or maybe periods?
But other parameters are even more important. Did you understand the stoty? did you know which person in the play was talking and with what effect? and did it in the end made sence and gave unity to the piece? did it gave access to these incredible long pieces and made them understandable to you? if so, the interpretation was correct. All other comments are merely low level thinking.（piy注：为直觉鼓掌）
Please, Yiming, tkae these considerations as my own and not as a defend for Libby's mrs. Wallfisch's playing. She will love to react on comments herself and will answer questions in a thourough way.But, if you think my thoughts are a contribution to the discussion, feel free to use them.Please, don't forget: it is the inspiration that creates music, not the rules.（泪奔）However, we must know of the rules in order how to speak a certain language.But, all your fellows speak the same language, apply the rules of rhethoric and grammer. Yet, they all speak in a different but very convincing way without speaking affected or in an artifical, pretended way.Let them please do that in music too.（很好的比喻啊。语言与音乐。）