Theatre Alla Scala: Self guided vs Guided tour

There does not appear to be a way to enter on your own, except for museum visit and one viewpoint (see the lower link,below).

You can find out about tours of the theatre itself here:

https://www.teatroallascala.org/en/visit/visit-the-theatre.html

For the museum:

https://www.museoscala.org/en/visit/museum-and-theater/plan-your-visit.html

Theater Visibility Admission to the Museum allows you to see the Theatre from the third-level boxes, but only when rehearsals, performances or events open to the public are not in progress.

Use the “best view” button to see a calendar of when you can get a look inside the theatre from the museum. It shows hour, day by day, when the theatre is accessible and when it is, or is not, illuminated.

Thanks. Very helpful.