BACHs trills from Prelude and Fuga BK2 no.20

[piani0player]

hi everyone
    i am very confuse with this A minor Prelude and Fuga BK2 no.20 by BACH ,because my teacher told me to start every trills on the melody note instead of starting the trills at the note above but i think the trills should always start on the note above for BACHs Prelude and Fuge.Is there a rules for BACHs trills or it doesn't really matter whether you start on  the top note or the melody note??

thank you

[allchopin]

im not a Bach fan (as my name implies), however, i know that normally you start trills on the written note. with Bach, i have heard it reversed (as well as in mozart). this makes the piece sound more 'classical'- ask your teacher about mozart's trills

[Ktari]

hehe, I'm working on the Toccata from Partita No. 6, and this is what my teacher told me: the trills begin on the dissonance (like, look at the chord in the other hand) -so in my case that would be starting on the written note, then going up... but then we listened to Glenn Gould's recording and he started a note higher than the written note, on the , uh, not-dissonance? hehe, so there you are, my teacher's like, if he can get away with it, you can too, but I suppose I think the first one makes sense...

[jlh]

A general rule of thumb is that for boroque music, always start on the note above unless you have reason not to.  For pieces in the classical period and beyond, this is reversed.