On: Everything we can't describe in music

[logrot]

Timbre can vary a lot day by day on the same instrument.

Violin and the bow are both made of wood and a rainy damp day can easily sound different than dry summer's day.

You can get good carbon fiber bows and they are much less weather sensitive.

You can also get carbon fiber violins but I haven't heard one that sounds as good as one made from wood.