Answer by taking a quote from the following article:

Stevens was born in Detroit, Michigan, and lived there until the age of nine, when his family moved to Petoskey, in the northern part of the Lower Peninsula of Michigan. He was raised by his father Rasjid and his stepmother Pat, only occasionally visiting his mother, Carrie, in Oregon after she married her second husband Lowell Brams. His mother is deceased. Brams later became the head of Stevens' record label Asthmatic Kitty.

On May 31, 2007, Asthmatic Kitty announced that Stevens would be premiering a new project titled The BQE in early November 2007. The project, dubbed a "symphonic and cinematic exploration of New York City's infamous Brooklyn-Queens Expressway", was manifested in a live show. The BQE featured an original film by Stevens (shot in Super 8 mm film and standard 16 mm), while Stevens and a backing orchestra provided the live soundtrack. The performance used 36 performers which included a small band, a wind and brass ensemble, string players, horn players, and hula hoopers. There were no lyrics to the music. The BQE was commissioned by the Brooklyn Academy of Music as part of their Next Wave Festival and performed on three consecutive nights from November 1-3, 2007. The performance sold out the 2,109 seat BAM Opera House without any advertising. After three weeks of rehearsing the piece with the three dozen musicians involved, he presented the 30-minute composition. The BQE was followed by an additional one hour of concert by Stevens and his orchestra. The BQE won the 2008 Brendan Gill Prize. The multimedia package was released on October 20, 2009. The release included a CD of the show's soundtrack, a DVD of Brooklyn-Queens Expressway footage that accompanied the original performance (not a film of the performance itself), a 40-page booklet with liner notes and photos, and a stereoscopic 3D View-Master reel. A limited edition version that features the soundtrack on 180-gram vinyl and a 40-page BQE-themed comic book starring the show's hula hooping wonder women, the Hooper Heroes, was also released.

What was the BQE?
"symphonic and cinematic exploration of New York City's infamous Brooklyn-Queens Expressway",