Both trumpeter Paul Tynan (Nova Scotia) and baritone player Aaron Lingston (San Jose) have serious classical music chops and both are master jazz players. For this, their sixth collaboration, they have chosen a chord-less trumpet - baritone - bass - drums quartet and it has nothing to do with the famous Gerry Mulligan / Chet Baker or Art Farmer sound. This is much more about harmonies than counter-points. The leaders split the writing credits and tunes like Traveler From An Antique Land are resonant with mystery, beautifully so. Arbitrary Rules is more in a funky soulful vein with spacey horns over an insistent beat.