'Toccata' from "Partita No. 6 in E minor BWV 830"

'Toccata' is not only long, which is about 2/3 of this Partita, but also hard to perform.

The reason is how to use discord of long 7th and short 7th notes.

In contrast to "Well tempered Clavier," it sounds like "Partita" or "Sonata" for unaccompanied violin.

Complex chord, also, is used at 'Scherzo' of "Partita No. 3," but it is noticed as 'scherzo.'

Here, however, it is titled popularly as 'Toccata,' which seems usual performance.

Because "Well tempered Clavier" has no complex chord, this type is not accepted widely.