I've got this lengthy solo passage in my piano piece (a transcription of a symphony, where this is the solo). The right hand plays the solo, and the left hand provides the quietest possible background harmonics, in the form of a constant, near-silent F-minor chord tremolo (soft strings in the original). Question is, because the solo is in an overlong bar (which takes about forty seconds to play), how do I notate the tremolo.
Here's one attempt, stretching a whole note over the entire measure. However, because it is so disfigured, you could be forgiven for not noticing that the thing is a tremolo at all.
A more 'correct' way, precisely matching the length values in the melody, just looks messy.
Using some obscure notation for extremely long notes, I can divide the bar up into fewer tremolos:
But I think I will split the difference, and put a number of these tremolos in a row to give the idea of a constant tremolo throughout the measure, even if the times don't add up.
So the latter is my preferred solution, at this moment. The question is: is there a better, more 'legitimate' way, to notate a tremolo of indeterminate length?
EDIT: Sadly, it looks like the trill notation as suggested by Laurence Payne is causing irresolvable issues with the music notation software I use. I would love to hear if that is the only suitable notation or if there are any alternatives. Leaving a bounty for that purpose!