stave layout: Fugue in C minor, Book 1 (extract) And here it is in open score, with added fingering: Fugue in C minor, Book 1 (extract), in open score Here is my stepladder approach for practising fugues: Divide the fugue into sections Practise each voice alone with the fingering and the articulation you will end up using Put together quite extraordinarily slowly in all combinations of two voices For more advanced players, it is great practice to mime one voice while playing the others out (touching the surface of the keys, or partially depressing the keys without sounding the notes). Again, exhaust the possibilities. Play through the section as many times as there are voices, each time bringing out an assigned voice and putting the others in the background. You may also omit one voice, and instead of playing it, sing it (while playing the other voices). Listen to how Helmut Walcha practised and taught Bach (from 1:20). Open score editions of fugues are invaluable not only as practice and study aids, but these are also great for duet playing and developing score reading skills. If you have two pianos in your studio, the  teacher can take all but one voice, and the student plays the remaining one. Or the other way round, of course. The student can fully experience each voice independently but within the context of the whole.  An open score edition can also be used for chamber groups -- Bach's music works fine with any instrumental ensemble.