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Do all triangles sound the same note in the same octave, or are there differences between models?

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It might not have a pitch. Percussion instruments like bells and blocks are often non-harmonic. –  endolith Jul 14 '12 at 19:12

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There are many differences, both in pitch and timbre. I've seen triangles used with a 10" side length down to 4", and you can purchase them made out of a variety of different materials and construction methods.

Some pieces even call for three different triangles of different pitch. So no, there's no defined standard pitch. A percussionist just chooses the triangle that he finds most appropriate for the style of the piece (which the conductor may override if he/she feels differently).

Not only that, but orchestral percussionists will carry around a set of triangle beaters of different sizes and weights to further fine-tune the tone of the triangle.

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So, if the pitch is the only the pitch, the note remain the same. But what note is it? –  Pascal Qyy Jul 14 '12 at 13:02
    
That's the opposite of what I just said. Different models of triangle have different pitches (or notes) based on their size and material. There is no standard pitch. –  NReilingh Jul 14 '12 at 13:10
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In general it's an non-pitched sounding tone, I find. With the overtones present in the sound of most triangles, It's difficult to pin down to a single pitch without another reference. You can certainly tell whether one triangle is lower or higher… but by how much is getting too fine, in my opinion. As NReilingh said, there's no standard note, and I would say that most triangle manufacturers try to get as far from a defined "note" as possible. –  Josh Fields Jul 14 '12 at 17:57
    
A lot of that comes down to your own ear. People routinely tune snare drums, for example, and that's a tone that is MUCH more difficult to distinguish than a triangle. Any percussive instrument, by definition, is pitched; but you are right: depending on the overtones present, some may be more easily picked out than others. –  NReilingh Jul 15 '12 at 4:25
    
thank you, excuse my ignorance –  Pascal Qyy Jul 15 '12 at 5:43

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