The Eighth Inter-American Music Festival will be held in Washington from May 2 to May 7. Its six concerts, all of them free to the public, will be given in the Kennedy Center on May 2, 3, and 4; the Library of Congress May 5 and 6, and the National Academy of Sciences on May 7. All but the last will be at 8:30. On May 7, the program will begin at 8 p.m. Requests for tickets, accompanied by a stamped self-addressed envelope, should be sent to Brazilian-American Cultural Institute, 4201 Connecticut Ave, NW, Suite 211, Washington, D.C. 20008.

On May 2, the program will be played by the Baltimore Symphony under Sergiu Commissiona, with pianist Caio Pagano as soloist. The music will be by Siegmeister, Villa-Lobos, Robert Lewis, Ginastera and Fernandez.

On May 3, the Festival Orchestra will play under Mario Tavares, with Antonio Menezes, cellist, in music by Villa-Lobos, celebrating the late composer's 90th birthday.

On Wednesday, Jorge Mester will coduct the Louisville Orchestra in music by Welcher, Mignone - with Carlos Barbosa Lima as guitarist - McLean, and Villa-Lobos.

The Thursday Library of Congress concert will present the Indiana University New Music Ensemble in music by Villa-Lobos, Cordero, Gandini, Heiden, Imbrie, Fox, Orrego-Salas and Eaton.

On Friday the Library will host the Quartet of the University of Brazil in music by Teppa, Piston, Guarneri, and Villa-Lobos. For the final concert, the Brazilian Pianist Ney Salgado will play music by Villa-Lobos, Santoro, and Prado, and the Inter-American Chamber Singers will sing the Villa-Lobos Mass in Honor of Saint Sebastian.

This year's Friday Morning Music Club's Competition is for singers. The semi-finals will be held at 9:30 a.m., Friday, April 29 in Barker Hall of the YWCA, lasting until 5 p.m. The finals, the following day, will begin in the Kennedy Center Concert Hall at noon. The public is invited to both sessions free.