There is actually a book "Beer Tours of Munich". Very helpful if you can find one before you go.

You can tour Weihenstephan, the oldest brewery in the world (and an excellent beer) by calling the brewery when you are in Munich or in advance. They are sometimes heavily booked. Other breweries in the city: Augustiner, Hofbrau, Hacker-Pschor, Paulaner. Hacker-Pschorr has a large "fest Saal" with music, food and a folk show.. some people will be coming in costume as Fasching gets a start now. Hofbrauhaus also has a large Festsall, and a small more intimate one when there isn't much crowd.In any event the Hofbrau's ground floor beer hall will be open. It's kind of a fun evening to have dinner on the first floor (our second floor) and then go down for a few hours in the kind of rowdy beer hall on the ground floor ("die Schwemme").
Paulaner has a very nice restaurant-pub at their brewery... try the famous Paulaner doppelBock dark beer. In Dachau( mayube 20 minutes on the SBahn), there is a very cozy and great pub at the Ludwig Thoma brewery... near the castle. Probably the best beer in Germany, Ludwig Thoma draft.
Your hotel can probably help you identify other beer halls... there are many, though not as many anymore with live music.

Have a wonderful time!