The population almost doubles in summer, mainly because of the jazz festival.

主要由于爵士音乐节的缘故，在夏季这里的人口几乎比平时多一倍。

《牛津词典》

Jazz is popular, especially in the summer when live performances are a regular occurrence at many of the city's outdoor cafes.

爵士乐很流行，尤其是在夏季，经常在许多城市室外咖啡馆现场演出。

youdao

And since 1985, Rebecca Parris has come north from the Boston area each year to sing at Marblehead Summer Jazz.

NPR: Rebecca Parris at Marblehead Summer Jazz

Originally recorded July 7, 2007 at Marblehead Summer Jazz.

NPR: Rebecca Parris at Marblehead Summer Jazz

" Jazz on a Summer's Day " (New Yorker Video ): Bert Stern's remarkable evocation of the 1958 Newport Jazz Festival, plus a behind-the-scenes documentary of the celebrated still photographer at work on his only motion picture.

WSJ: Enjoying Movies, Minus the Multiplex