Castle Grafenegg Music Festival – Every year in August, audiences flock to hear performances by the London Symphony Orchestra and the likes amid the beautiful setting of a centuries-old castle and adjacent park.
http://www.grafenegg.at/home/en

Innsbruck Summer Festival – Historically informed performances of Old Music are the focus of this festival in the Tirolean capital.
http://www.altemusik.at/en2010/index.php?mode=start

Styriarte – Famed conductor Nikolaus Harnoncourt is the father of this festival which features performances of the Concentus Musicus Wien, an ensemble performing Early Music on period instruments and the extraordinarily dynamic Chamber Orchestra of Europe.
http://styriarte.com/en/

Salzburg Festival – Featuring opera, concerts and drama, the Salzburg Festival enjoys worldwide recognition as one of the most outstanding classical music events today.
www.salzburgfestival.at

Summer Festival at Lake Constance – Known as the “Bregenzer Festspiele”, this event draws crowds with opera and concert performances by the Vienna Symphonic Orchestra and the largest floating stage in the world.
www.bregenzerfestspiele.com

Tirolean Festival Erl – With the Tirolean mountains as an impressive backdrop, the performances of Wagner’s oeuvre are truly awe-inspiring and receive outstanding reviews. http://www.tiroler-festspiele.at/

Schubertiade Schwarzenberg – The annual meeting place for an international audience that seeks an exceptional cultural experience: hearing music performed by outstanding artists in idyllic surroundings.
http://www.schubertiade.at/Schubertiade/f_programm.2H.html

Vienna Festival Weeks – Encompassing everything from symphonic concerts and opera to theater performances and exhibitions, this significant festival spices up Vienna’s cultural life during the summer.
www.festwochen.at

Operafestival St. Margarethen – An old Roman quarry is the setting for this exciting summer festival in Burgenland. International stars and popular operas guarantee a spectacular experience.
www.ofs.at

Mörbisch Festival on the Lake – The picturesque town of Mörbisch is the location of the world’s greatest operetta Festival. Once you have seen the impressive open air stage you will be captivated.
http://www.seefestspiele-moerbisch.at

Hadyn Festival – The works of Joseph Haydn are at the heart of the festival in Eisenstadt, where Hayden was head of the court ensemble at the Esterhazy castle.
www.haydnfestival.at

The Linz Klangwolke (Cloud of Sound) – The opening event for the BrucknerFestival in Linz is a spectacle of pioneering classical music performances and electronic visualization. www.klangwolke.at