Parenting music lesson snafu 

Kid's gotten interested in playing music & has been trying out various instruments over the last few months. (Yay for rentals!)

The latest is cello. When we got it home he noticed the bridge was off-center. He can replace a string, but we all agreed to wait until his first lesson & let the teacher adjust it.

He had his first lesson yesterday, with the same teacher he took violin from a few months ago. First order of business was to adjust the bridge...

Parenting music lesson snafu 

So the teacher started carefully loosening the strings while holding the bridge (which is held in place entirely by the tension of the strings) until she could shift it into place. And as soon as it moved, we all heard a loud *THUNK* from *inside* the cello.

The sound post, which both provides structural support and transfers vibrations between the front and back of the instrument, had fallen out.

And was rattling around inside the cello.

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Musical instrument acoustics 

Interesting: I went to look up exactly what a sound post does for a violin/cello/etc, and it's not so much transmitting vibrations between the top and bottom plates as it is providing a fulcrum so that the bridge can transmit the sideways vibrations of the strings (constrained by the bow pressing on them) to vertical vibrations in the body. Plucked instruments like guitars don't need that because the strings can vibrate in all directions

music.stackexchange.com/questi

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