SERIES PREMIERE: “Eight cities, eight episodes, eight songs.” Dave Grohl, formerly of Nirvana and now of Foo Fighters, concocted an absurdly ambitious concept for the group’s next album. Record each song in a different studio, in a different city – and don’t write the song until you get to that city, absorbing its culture while retelling the history of its local music scene. And he emerged not only with Sonic Highways the album, but Sonic Highways the HBO documentary series: eight episodes, each taking place in a different city as Grohl seeks out musicians, producers and musicologists, and ending with the song written in that city and performed by the Foo Fighters. Collect them all. Trade with friends.