Phase I or Phase II Music 27

Im wondering if I should phase I or phase II Music 27. I know its a popular class since it is easy and I know it has like 400 seats so its a fairly big class but I can only work out two of the available discussion because of sports practice and the discussions are only 30 people each. The other classes I’m registering for are Econ 1 and Stat 20 and Im not sure if I should phase I those two classes and risk Music 27 or phase I Music 27 and either Econ 1 or Stat 20. Any suggestions?