And it's not a double sharp.
I saw it in Miley Cyrus Fugue in measure 88 between the 3rd and 4th beat for the right hand. It's being reached at 2:42-2:43 in the video and I don't hear anything special. Here is a screenshot for convenience:
2 Answers
May I suggest that it is not an 'x' per se, but actually two lines clarifying the voice leading for the top voices. Such lines are found in the first two bars as well.
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This is my thought as well. It's strange though, this would seem to indicate that a melody line is depicted in the top voice, which looks to be the case in all previous measures, as well as the first half of the measure in question, but at the point this happens, the inverted stems/flags stop, which would suggest the separate voice also stops. If that's the case, I'm not sure why they would show this sort of voice exchange. Commented May 2, 2016 at 13:47
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Yes, I agree that it is strange. But it seemed to be the most reasonable explanation. Also, keeping in mind that the score appears to be prepared by the composer and not a professional engraver/copyist (and as such, not proofread) I guess it is to be expected.– JohannesCommented May 2, 2016 at 16:30
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I agree. I can't think of any other meaning that this could hold. And yes, I imagine it's not been proofread. Commented May 2, 2016 at 17:53
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4@Johannes is undoubtedly correct. It's however not great notation. The usual notation for crossing voices in one hand would be separate voices with oppositely pointing stems, much like the earlier measures. Mind you, most of the voice crossings in this example aren't going to sound like voice crossings.– user16935Commented May 3, 2016 at 0:36
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1Agreed with the general consensus here about voice indication. However, the score is a mess and should be cleaned up. Commented May 3, 2016 at 23:22
If you listen to the recording, the melody voice in bars 88-89 really goes f f f g g g ees c' | g ...; this is probably a way how the author wanted to present this fact, using voice/staff switching lines.
It would have been actually better to use the proper notation of the leading voice:
cis4.anda2in bar 84 do not share their stem, but similar notes in other bars do? What is the half rest in bars 84,85 good for when it does not belong to any voice? Etc.