The left hand in all the versions on this page is different to the original. Left-hand versions as 'proper' Hanons are given to practice.
You might notice that the definition of 'canon' as a delayed repetition of the exact same music is being progressively more and more ignored! In reality, most of these examples are harmonisations of the Hanon exercises, with the left hand starting 'late'.
The left hand is effectively playing tenths below the right hand.
The Exercise 9 left hand ascending pattern spans only four notes and never uses the thumb.
(If played as a two-handed pattern, this will apply to the right hand descending.)
The left hand pattern descending is pure inverse of the ascending (but not as regards fingering).
The Exercise 11 left hand ascending pattern covers only a five-finger position and never uses finger 4.
Descending, the left hand pattern is different again. The hand covers the usual Hanon six-finger position and plays 1-2-3-2-5-4-3-4.
This sounds very like a Hanon pattern. Try playing a two-handed ascending pattern with the right hand leading, playing that fingering from C.
In order to harmonise satisfactorily, the left hand in Exercise 17 plays only a six-note pattern, spanning only five notes (ascending and descending), and simply has a rest where the two missing notes should be.
In order to harmonise satisfactorily, the left hand in Exercise 17 plays only six-note patterns, spanning only five notes (ascending and descending).
The rests in the left-hand practice exercise have been removed, so the exercise is in three-eight (six sixteenth notes).
Descending, a note is repeated over the bar line. The hand must make a lively "hop" on it to make playing the music possible.
In order to harmonise satisfactorily, the left hand in Exercise 19 not
only changes the right hand original, but ties the last note of the
pattern over as well.
In order to harmonise satisfactorily, the left hand in Exercise 19 plays only seven-note patterns, tying the last one as the first note of the next pattern.
A good exercise in its own right.
The left hand pattern is only one note different to the right hand pattern, but descending, it starts only a semi-quaver (16th-note) after the right hand.