Casa da Música (English: House of Music) is a major concert hall space in Porto, Portugal which houses the cultural institution of the same name with its three orchestras Orquestra Nacional do Porto, Orquestra Barroca and Remix Ensemble. It was designed by the Dutch architect Rem Koolhaas with Office for Metropolitan Architecture and Arup-AFA, and was built as part of Porto's project for European Culture Capital in 2001 but was only finished in the first half of 2005 and immediately became an icon in the city. The Building engineers were Arup (London) together with Afassociados (Porto). Inside Outside (Petra Blaisse) designed the large 13 curtains, ranging from 22mx15m to 65mx8m, and the gold leaf wood grain pattern on the large auditorium.
Although the opening day concert took place on 14 April with Clã and Lou Reed, the building was inaugurated on 15 April 2005 by the Portuguese president. The Prime-minister and many other notable politicians and Porto society were present for the concert by the Orquestra Nacional do Porto.
Casa da Música has two main auditoriums, though many other areas of the building can very easily be adapted for concerts and other musical activity (workshops, educational activities, etc.).
The large auditorium has an initial capacity of 1,238 people, but can vary according to the occasion.
The small auditorium is tremendously flexible, and has no definite number in relation to the capacity. On average the room has capacity for 300 people sitting down, and 650 people standing, though these can drastically change depending on the size of the stage, its location, the arrangement of the chairs, the presence and size of sound and recording equipment, etc. The restaurant at the top of the building was opened far later than was originally planned. Functioning since August 2006, the restaurant's original planned capacity for 250 people was decreased to space for some 150.
September 2008 Casa da Musica hosted the Orquestra Nacional do Porto taking part in explorative public presentations where performed music was captured alongside musician's and conductor's expressive gestures. Various sensor networks sourced and translated musical expressions into computer driven visual interpretations of lighting, projected images, and real-time improvisations for the audience to experience added nuance of performance. A scientific article informs on the concept.
Scientific articles are also published on special needs performances/workshops in Casa da Musica 2007 & 2008.