opera, symphony, theater - Buenos Aires?

[vmkil96]

I will be in Buenos Aires May 31 - June 2 and June 5-8.

I really would like to see opera, or ballet or listen symphony.

I know that teatro Colon will be closed till 2010. I was looking online but could not find much of anything.

Is there any websites were I could find what is going on in Buenos Aires on those days, were I could get to some see an opera or symphony?

Websites of course can be in spanish.

I would really appreciate your help.