by Scott Yanow 　　Pianist Brad Mehldau's debut as a leader features his straight-ahead style in trios with either Larry Grenadier or Christian McBride on bass and Jorge Rossy or Brian Blade on drums. The well-rounded set is highlighted by tasteful and swinging versions of five standards (including John Coltrane's "Countdown," "It Might As Well Be Spring," and "From This Moment On") and four of the pianist's originals. This CD (which is sometimes available at a budget price) serves as a fine start to what should be a productive career.