How to decide if F#9 is f sharp dominant ninth chord or f dominant sharp ninth chord? Similarily for Gb9 also
F#9 it is most likely an F sharp chord with a ninth. An F chord with a sharp nine would probably be a dominant chord and be written as
Thanks for the comments! So just as
F#13 is short for
F#9 can indeed be short for
F#7,9. In my practice, I have rarely seen it abbreviated like that – maybe because of the ambiguity you're asking about. So in theory,
F#9 can actually be both.
What do we do to disambiguate? Here are a few options:
If you mean a dominant chord with a sharp ninth, use
F7#9. If you mean an F# chord with an added ninth, use
You could also try to use space or parentheses to make things clear:
In handwriting (or with superscript on a computer) you can make the meaning clearer by superscripting the options in smaller text.
I feel the least ambiguous solutions are
Chord names will never occur isolated! Context would help like Tim says. The writing with the computer keys is F# 9 = Fsharp 9 or F #9 = F7 #9, but normally the printing of a notation program or professional layout should be F# (sharp=subscript)and 9 or F (#9=superscript). Everything else (as asking without context) is just confusing or fishing for reputation points ;)
I have not seen it written, but the "rule" seems to be don't omit 7 when extensions are altered.
So, in this questions the 7 is omitted, therefore the 9 isn't altered.
Accidentals are suffixed to the right of letters but prefixed to the left of numerals. That sets up the ambiguity and something needs to added - or superscript used - to delineate whether the accidental is a suffix or prefix.
Some examples with the numerals given in parenthesis. As you drop supposedly unnecessary numbers and parenthesis you eventually get the ambiguous
F(7)(9) => F(9) => F9 F(7)(#9) => F(#9) => F#9 F#(7)(9) => F#(9) => F#9 F#(7)(#9) => F#(#9) => F##9
I suppose you could put back the parenthesis
F(#9) but keeping the seventh
F7#9 seems clearer to indicate an altered chord. Otherwise assume the extension is not altered and the accidental applies to the letter.