For his second album, Late Registration (2005), he collaborated with film score composer Jon Brion and drew influence from non-rap influences such as English trip hop group Portishead. Blending West's primary soulful hip hop production with Brion's elaborate chamber pop orchestration, the album experimentally incorporated a wide array of different genres and prominent orchestral elements, including string arrangements, piano chords, brass flecks, and horn riffs among other symphonic instrumentation. It also incorporated a myriad of foreign and vintage instruments not typical in popular music, let alone hip hop, such as a celesta, harpsichord, Chamberlin, CS-80 analog synthesizer, Chinese bells and berimbau, vibraphones, and marimba. Rolling Stone described Late Registration as West claiming "the whole world of music as hip-hop turf" chronicling the album as "his mad quest to explode every cliché about hip-hop identity." Critic Robert Christgau wrote that "there's never been hip-hop so complex and subtle musically." For a period of time, Kanye West stood as the sole current pop star to tour with a string section, as audible on his 2006 live album Late Orchestration.
What sort of orchestra did Kanye tour with while promoting his second album?
a string section