In which Swiss city is a famous jazz music festival annually held?

The Montreux Jazz Festival (formerly Festival de Jazz Montreux and Festival International de Jazz Montreux) is a music festival in Switzerland, held annually in early July in Montreux on the Lake Geneva shoreline. It is the second largest annual jazz festival in the world after Canada's Montreal International Jazz Festival.

The Montreux Jazz Festival was founded in 1967 by Claude Nobs, Géo Voumard and René Langel with considerable help from Ahmet and Nesuhi Ertegün of Atlantic Records. The festival was first held at Montreux Casino. It lasted for three days and featured almost exclusively jazz artists. The highlights of this era were Miles Davis, Keith Jarrett, Jack DeJohnette, Bill Evans, Soft Machine, Weather Report, The Fourth Way, Nina Simone, Jan Garbarek, and Ella Fitzgerald.

Originally a pure jazz festival, it opened up in the 1970s and today presents artists of nearly every imaginable music style. Jazz remains an important part of the festival. Part of the festival's expansion was due to coproduction by Quincy Jones who brought many international artists in the early 1990s. Today's festival lasts about two weeks and attracts an audience of more than 200,000 people.