Duo-pianists Steven and Nadya Gordon have put 38,000 miles on their new GMC Jimmy in the past seven months. "Sometimes I don't know if we're piano movers, truck drivers or concert pianists," says Steven, who at each stop on the couple's current 40-city tour must instruct helpers on the loading and unloading of their twin Bo sendorfers from a rig he designed.

The Gordons' Bo sendorfers are the only two currently touring in the world (only 20 are made yearly, at a cost of $70,000 each). To ensure that the two mammoth black grands remain perfectly tuned, they are hauled behind the truck in a heated and humidified trailer. "They just don't like to get cold," says Steven, referring to the instruments as if they were children or family pets.

The Gordons will be at George Mason University's Harris Theatre Wednesday for an 8 p.m. concert.

The couple's "Album of Two Piano Masterpieces" program will include Mozart's "Overture to the Magic Flute," Ravel's "Introduction and Allegro" and "Rapsodie Espagnole," Stravinsky's "Three Movements from Petrouchka," Rachmaninoff's "Fantasy," Op. 5, and Gershwin's "Rhapsody in Blue." For ticket information call 362-2940.