BSO Associate Conductor Marcelo Lehninger returns to the Symphony Hall podium for a concert spotlighting members of the orchestra. Four BSO principals take center stage for Mozart's seldom heard Sinfonia concertante for winds, last performed by the BSO in 1989 (with a different solo quartet). Brazilian composer Heitor Villa-Lobos's Bachianas brasileiras No. 5 for soprano and cellos is one of several like-named pieces intended to meld Brazilian musical ideas with the classical tradition. One of Villa-Lobos's most popular scores, the work is in two parts, sung in Portuguese: an Aria with words by Ruth Correa (who sang its premiere) and a Dance with words by Manuel Bandeira. The accompaniment for cellos alone makes it a rarity on orchestral concerts; these will be the first BSO performances of the piece. Closing the concert is Beethoven's powerful Symphony No. 5, among the best-known of all orchestral pieces.