On February 22, Ars Nova Workshop is presenting a concert by the Celestial Septet in Philadelphia, which will be available to non-Philly audiences for free via live webcast. After only four concerts in 2008, this epic ensemble combining the Nels Cline Singers and the ROVA Saxophone Quartet return for only five US appearances, beginning with this night in Philadelphia. (Full tour info here.) Given the rarity of this celestial union, they’ve teamed up with a local webcast production crew in order to share the Celestial Septet experience with international audiences. Registration for the webc