I remember that name now, Tureck! I saw a short clip of her playing a fugue and whatnot on the Classic Arts Showcase that is broadcasted free without commericials 24 hours a day on whatever station decides to carry it. She wasn't playing on a piano but on a harpsichord. I can't recall exactly what I thought of it at the time but the tempo seemed to be correct - this is all I can recall.
But she played on a harpsichord. Perhaps this is the reason you like her interpretations, Bernhard? I mean the way she played since the lack of dynamics is different than on a piano. Perhaps we should all start playing on a harpsichord because it would teach us how to phrase passages et al and work with limited range since dynamics can be used to conceal lack of expression - play the bass really loudly to cover up lousy melody playing. 
He he he

, Faulty, Now you really made me laugh. Rosalyn must be turning on her grave!
She is the one who originally advocated playing Bach on the piano using the full range of sonorities of the instrument. She abhorred Gould’s playing which she thought was too limited (Gould actually had his piano “doctored” so that it would sound like a harpsichord).
You see, in the 30s/40s the greatest keyboard exponent of Bach was the Polish harpsichordist Wanda Landowska, a very dogmatic woman, who was one of the great forces behind the “authentic” early music revival. She was adamant that Bach could only be played on a harpsichord. In fact she was so successful in her campaign of playing Bach solely on historical instruments that Claudio Arrau gave up playing Bach on the piano (even though he had given a cycle of recitals in which he played all of Bach keyboard works). Arrau was later to regret this decision very much and went back to Bach in his 80s.
Needless to say, a young (in her 20s) upcoming Tureck clashed head on with well established in her 60s celebrated Landowska. They had a conversation about it all, and it started well enough, but soon they were at each other throats. From that conversation came the often quoted phrase (usually quoted wrong or missing the names of the people invoved):
Tureck to Landowska (admitting that they would have to agree to disagree):
“Well, you play Bach your way, I will play Bach his way!”
You see, Tureck besides being an accomplished virtuoso was also a formidable scholar who would investigate all possible sources of Bach’s manuscripts. Her wirtings on the shortcomings and contradictions of the early music movement are worth reading.
Yes, she played Bach on the harpsichord, but only as a pedagogical device. You see, she would play exactly the same piece on the harpsichord, and then on the piano using the full range of sonorities and in so doing demonstrate her main point to the audience: that not only Bach did sound better on the piano, as Bach’s music was instrument independent. She also played the Theremin (a precursor fo the modern synthesisers) to show that Bach would sound good even on an electronic instrument. The clip you saw probably was followed by a performance of the same piece either on this piano or on the theremin, but they just showed the harpsichord part.
Rosalyn Tureck single handedly brought Bach back to the piano and was the most important influence on Glenn Gould (but she was critical of him, and Gould did not want to give her too much credit for his own playing - although he did give her some credit). She believed in pedalling, in using dynamics, and she hated when people suggested that Bach should be played machine-like. Here are some instances of her wisdom that I collected over a number of her master classes I attended (as a member of the audience):
Rosalyn Tureck’s wisdom:
Legato touch:
Legato means to make a connection, to bridge a gap. A bridge must touch the two sides of the abyss it crosses. If it touches only one side, it can not function as a bridge. If one lifts the finger before playing the next note there will be a gap, even if it is just for a split second.
There are infinite detached touches, but only one legato touch.
Repeated notes:
It demands great technique to do repeated notes legato. But it is rare that such legato is required. Usually repeated notes should be played detached, and this detachment will be part of the strength of the musical statement. In Bach particularly, repeated notes have a specific symbolism, which we can see from his choral work. This is the symbolism of words and ideas, specifically the phrase I believe in God.
Chromaticism:
Bach uses chromaticism whenever the mood is meditative or contemplative.
Counterpoint:
Much emphasis is played on melodic counterpoint. But there is rhythmic counterpoint as well, which is at least as important.
Rhythmic motives are as important as melodic ones: they give shape to the structure.
Virtuosity:
Some people believe I play fast. In fact, I do not play that fast, but I take time to make sure that every note is heard. It will sound faster and more virtuosistic if you kep the structure even at a slow tempo - people will have more to hear within a given unity of time.
Beats:
Stressing the correct beats brings out the harmonic structure of the motif.
The combination of downbeat with harmony is a clear indication of Bach’s intentions.
Everything is right on the page, but people don’t pay attention.
Difficulty:
Difficulty is not a premise on which to build an interpretation.
Artistry:
Be an artist, not a perfomer.
Pedal:
May one use the pedal when playing Bach?
The basic function of the pedal is to sustain sound. The harmonic idiom uses chords, resolutions and so on. But in counterpoint one does not need to sustain for there are multilevels that fit together.
So the question becomes: What is there to be sustained? Answer this question and you answer the pedal question. In general vertical music is more likely to require pedal than horizontal music.
Embellishments:
There is only one kind of trill in 19th century music. But in the 16th and 17th centuries trills could be played in many different ways. Embellishments on dotted notes in the French style have their own specific meaning.
Many pieces that are thought to be melodic (e.g. variation 13 of the Goldberg variations, Sarabande on partita 1) are in fact built upon embellishments. Bach has simply written out the embellishments so as not to leave any room for confusion or ambiguity.
You can also read an interesting article about her here:
https://www.guardian.co.uk/arts/story/0,3604,249819,00.html and here:
https://www.guardian.co.uk/obituaries/story/0,3604,1001460,00.htmlBest wishes,
Bernhard