It was a great idea when Contemporary Records began reissuing the recordings of Terry Gibbs’s “Dream Band,” recordings made in concert in Hollywood in 1959; it’s another great idea for Gibbs to bring the music from that band to town this weekend and line up a dozen of Chicago’s best horn players to whirl through some of the finer charts ever to grace a bandstand. Make no mistake: despite the presence of some great west-coasters in the Gibbs groups of 30 years ago, it was the book that made this band. The arrangements came from such lionized arrangers as Bill Holman and Al Cohn, Marty Paich and Bob Brookmeyer, Med Flory (who went on to form Supersax) and even Lennie Niehaus–who these days handles the musical chores for many Clint Eastwood films, including Bird–and they stand up today like California redwoods. Whether a few days of rehearsal can whip up the kind of excitement these arrangements generated when they were fresh remains to be seen. But if anyone can make that happen, Terry Gibbs–a demon vibist and all-around type A personality–is the guy. Joining him in the rhythm section are Chicagoans Larry Novak (piano) and John Whitfield (bass), and Gibbs’s fellow Californian Frankie Capp on drums. Tonight and Saturday, 9 and 11 PM, and Sunday, 4, 8, and 10 PM, Joe Segal’s Jazz Showcase, Blackstone Hotel, 636 S. Michigan; 427-4300.