The small diagonal line shown above comes from Chopin's Ballade #1 in G minor, measure 170. What does the small diagonal line between the two notes mean?
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4Please show that bar and the ones either side. – Tim Nov 01 '17 at 09:11
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Related question: [What does this split stem notation mean?](https://music.stackexchange.com/q/24030/70803). – Aaron Aug 09 '21 at 06:41
3 Answers
It is a "chord" consisting of both B flat and B natural.
The 19th-century notation for this was just two notes on the same stem, with two accidentals (flat and natural) in front of them. In the 20th century some composers started using two separate notes joined by a "forked" stem. The OP's graphic looks like a poor attempt to reproduce this with an (unknown) notation software application that can't do it right - or the user didn't know any better.
Klindworth's edition (1880): (note the horrible 5:3 tuplet notation with the tiny slur over the 5!)

Breitkopf und Härtel (1878) has staccato dots over the notes, which somebody may have mistaken for the slanting line:
More modern notations:
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Nice detective work. Given that the original slant bar doesn't even show up in Dolmetsch's list, this looks like a good interpretation. – Carl Witthoft Nov 01 '17 at 15:05
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Sorry for the late reply and thanks for the answer. And yes, it is Chopin's Ballade. – soap Nov 02 '17 at 01:03
The B natural and B flat should be played together as a chord.
The notation in the OP is an attempt to reproduce the one used in the 1894 Mikuli edition of the Ballade.
The more modern notation mentioned by user19146 is used, for example, in the Dover/Paderewski edition (1981).
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- 10
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Looks like a slide. You can't do that on a piano, but you can emulate smearing from B natural to B flat (which I presume this notation is supposed to suggest) by striking both right after another and releasing the B natural after striking the B flat and then release the B flat "regularly" on time.
Probably intended to render a "blue note".
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Normally the first note will be written as a grace note, smaller than the ordinary dot. – Tim Nov 01 '17 at 10:49
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@alephzero you sure about that? I don't see that note pair in an IMSLP copy. – Carl Witthoft Nov 01 '17 at 12:28
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