I think you mean ‘orchestra’. A ‘symphony’ is a piece of music. Please don’t fall into using these horrible slang terms.

This was part of an answer to this question:

22 yr old oboist..if I keep going do you think I have a good chance of playing in a good symphony?

The questioner then provided a link to her YouTube videos.

I checked, and the former comment was given by someone in the UK. So perhaps in the UK you can’t call an orchestra a symphony. Does anyone know about this?

PS I play in Symphony Silicon Valley.

Yep. A symphony.