They say that keeping things fresh is the key to a good relationship. But that advice doesn’t just apply to romance. Since 1997, jazz saxophonist Ivo Perelman and pianist Matthew Shipp have recorded more than three dozen albums together; some as a duo, some as two-thirds of a trio, and some as half of a quartet, but always with something new in mind. Now they’ve done something else different with Special Edition Box, a limited-edition boxed set that includes a studio album on CD, a live concert on Blu-ray, and a book on, uh, paper. And while this may be new for them, anyone who’s enjoyed their previous duo albums will find that it’s still them doing what they do so well.