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"De Brevitate Vitae" ("On the Shortness of Life"), more commonly known as "Gaudeamus Igitur" ("So Let Us Rejoice") or just "Gaudeamus", is a popular academic commercium song in many European countries, mainly sung or performed at university graduation ceremonies. Despite its use as a formal graduation hymn, it is a jocular, light-hearted composition that pokes fun at university life. The song dates to the early 18th century, based on a Latin manuscript from 1287. It is in the tradition of carpe diem ("seize the day") with its exhortations to enjoy life.
It was known as a beer-drinking song in many ancient universities and is the official song of many schools, colleges, universities, institutions, and student societies.
http://en.wikipedia.org/wiki/Gaudeamus_igitur