Aeolian Mode
a scale
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They form a pattern. A distinctive pattern where each note can be the start of any type of scale. Each scale can be played starting on any note but each scale will have its own unique pattern on the keyboard.
On any instrument, an A major scale has three sharps: F#, C#, and G#. The scale is A, B, C#, D, E, F#, G#, A. If you are asking about a concert A major scale, you'd play a B scale on any Bb instrument, like a tenor sax. Now you've got 5 sharps, and the scale is played B, C#, D#, E, F#, G#, A#, B. It's a knuckle buster.
a scale
That depends on the instrument.
Balance scale
A scale
a scale
A scale.
A spring scale measures weight.