For those of you who are not defeated by the cold and want to take advantage of the students discounts at Symphony Hall, here is an invitation to enjoy Mozart's Requiem this Saturday at 2PM. The least expensive seats are $25. However, if you decide, you can buy the"impromptu student pass" for $25 and enjoy all the concerts of this season (which there are three including this Saturday's). The student pass can be purchased across Symphony Hall at 301 Mass Ave with your BU ID. If you take the BU shuttle, get off at the symphony stop and there you can get the pass).