If it's a viola (and alto clef), then it's first position D and A strings but same fingering and bowing.
AND PLEASE ADD A TITLE so others can access it!
Well, that was a stupid idea!
The only thing I could achieve, assuming it wasn't slow music, was to double-stop and tremolo it. Then I came back to the pc and noticed that you've used the word tremolo in the title, so maybe you've answered your own question?
Yes, of course you do, but you do not simultaneously change the bow very fast as in a tremolo. You play it under slurs.
My point is that tremolo refers to a very specific extremely fast repeatedly articulated bow stroke, which is not used in this example.
The example in this thread is a slurred octave trill which sounds like a tremolo, but smoother than the bowed kind. The same notation is found in piano arragements of sustained orchestral chords.
Edit: Let us not confuse a composer's phrasing marks with practical bowings.
I think that’s true technically: there will be a moment of silence when the bow is momentarily stationary before changing direction. However, I don’t feel the effect of tremolo to be loud/soft/loud/soft... . Rather, it’s an intensification of sound and is often used to make loud passages seem louder. Most listeners (and violinists) perceive it as adding volume to the passage where it is applied. (I’m writing about the fff tremoli here, not the quiet shimmer that I mentioned above, though the effect there is also of continuous sound.)
I guess the rate of tremolo is much more rapid than the vibrato of many singers, particularly operatic sopranos and Wagnerian basses, whose oscillations are often very audible. I can’t recall who, but a critic complained of a vibrato so wide you could drive a bus down the middle.
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