The Maracaibo Symphony Orchestra did itself proud in the second concert of this year's Inter-American Music Festival at the Kennedy Center last night. They chose a program that displayed their talents in a variety of lights and played it to the hilt.

Ginastera's early "Pampeana" No. 3 provided a fine showcase for their brilliant tone. This is lyrical and even romantic Ginastera, full of good ideas well worked out, and the orchestra moved through it with elan.

Barber's First Symphony requires a wider mix of sonorities. Here it is breadth that makes the music live and the orchestra met this need admirably.

Clearly, conductor Eduardo Rahn in not only a fine director but an effective teacher as well. The orchestra gives every evidence of demanding training and well-schooled response The musicians' attacks are crisp and their ensemble quite impressive.

The concert opened with "Tupac-Amaru" by Alfredo Del Monaco, which, according to the program notes, is a homage to the "attitude" of the last of the Inca chiefs. Big, blocky hunks of single tones set in an almost static context would lead one to suspect that Tupac-Amaru was uncommonly stubborn and sedentary.

A pleasant-enough mishmash of folk tunes, sort of a Venezuelan Quodlibet by Castellaos called, "El Rio de las Siete Estrellas," and the Villa-Lobos "Choros" No. 6 completed the program.