Task: Question Generation
Input (English): Passage: That month, the city announced that the Pritzker family had donated $15 million to fund Gehry's bandshell and an additional nine donors committed a total of $10 million. The day of this announcement, after it became clear that Cindy Pritzker would fund the project, Gehry agreed to the design request. In November, when his designs for both the pavilion and bridge were unveiled, Gehry already had the basic design for the bandshell, but said the bridge's design was very preliminary and not well-conceived because funding for it was not committed. The BP Pedestrian Bridge is designed to serve as a buffer against street noise, helping the pavilion's acoustics.According to the Guggenheim Museum, the Jay Pritzker Pavilion "suggests musical qualities", much like Gehry's Experience Music Project in Seattle, Washington. The Pritzker Pavilion follows a series of open-air projects by Gehry, such as the Merriweather Post Pavilion in Columbia, Maryland, the Concord Performing Arts Center in Concord, California, and numerous renovations to the Hollywood Bowl in Hollywood, California.
Output (English): What are the names of the four open-air projects that Gehry worked on?