When the slash is diagonal, it indicates a chord with a different bass note; when the slash is horizontal, it indicates a chord over another chord, as in the example you provided. In your example, besides the horizontal slash, there are also diagonal slashes; it is a very detailed notation, probably to achieve a very specific sound effect.
J
JazzMania
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Reply 5 by JazzMania
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116
ga3tan0 wrote:
Do-7/Bb
D7+/F#
Bb C Eb G over f# d a c#
ga3tan0 wrote:
I was wondering if it is a modern norm not yet approved by musical instruction, since chords are expressed in the classical manner like:
I don't think institutions have anything to do with it ...what should they approve?
Even if written with such detailed symbols, they work a bit against improvisation (too detailed), as Geppino says, it is probably a precise and (hopefully) one-off request