Info from Wikipedia
The Manchester Academy, originally known as the University of Manchester Main Hall, is composed of four concert venues, located on the campus of the University of Manchester, in Manchester, England. The four venues are: Academy 1, 2 and 3 and Club Academy.

Academy 1: Opening in 1990 with a capacity of 1,500. At that time, it was considered the third largest concert venue in Manchester. In 2013, the capacity was increased to 2,600. Unlike the other venues, Academy 1 is in a standalone building, south of the original Students' Union. The venue is often just referred to as "Manchester Academy"
Academy 2: Located on the first floor in the original Student Union building, the venue was originally known as the University of Manchester Main Hall. It began to host jazz musicians in 1963. Its capacity is 950.
Academy 3: Known as the "Hop and Grape", the venue is located on the second floor of the original building. Sometime in the 1980s, it was called the "Solem Bar". Of the four venues, it is the smallest, housing 470 guests.
Club Academy: The third largest venue is located in the basement of the original building. Originally known as "The Cellar" and the "Cellar Disco", the venue grew in popularity after the demolition of The Squat. It can hold up to 650 guests.