Jazz has a great tradition of piano trios extending as far back as the genre itself. The stripped down instrumentation of piano, bass and drums maximizes the room for interplay among musicians while maintaining a softness and intimacy that might be lost in larger ensembles. One of today’s most inventive trios, featuring pianist Jean-Michel Pilc, drummer Ari Hoenig and bassist François Moutin, will make an appearance tonight at Blues Alley as part of the club’s French jazz series.