The Duo for violin and viola was written in Rio in 1946.Villa-Lobos wrote relatively little in the early years of the Second World War. However in the happier years from 1944 to 1946 he wrote this duo a string trio and three quartets not to mention two symphonies an opera a piano concerto and a host of less foraml works of every kind. The duo was given its first performance in New York during February 1948 by Lillian and Joseph Fuchs.

To see the summer sky for Violin and Viola falls into four movements. The first movement opens with the two instruments sounding almost as one playing very high glassy harmonics. Gradually an expressive viola solo emerges withboth instruments descending to their lower ranges. A livelier quasi scherzando solo for violin accompanied by viola pedal notes leads to a chorale like passage the violin at the top of its range whilst the viola is at itslowest. The movement ends with the two instruments coming together once again on a unison Bb and fades away almost as it has begun but this time in the husky lower registers.The second movement is much faster and openswith a downward flurry for both instruments. A continuous pizzicato line for viola is interrupted by more violent passages in the violin. The two instruments come together in a dance-like passage before the roles are reversed.Finally an ecstatic melody surfaces in the viola and is later continued in the violin before the movement closes with the spiky figures of its opening the two instruments ending in unison.The third movement encompasses isthe most delicate and still music of the piece. After a very tranquil opening an expressive violin melody is accompanied by a gentle rocking figure in the viola. Tentative at first intensity and speed gather until the violinreaches stratospheric heights. Both of the instruments play at the extremes of their registers before moving to common ground for a more lively textural passage. This is followed by a passionate reminder of the movement’s opening gradually fading away to nothing.The piece ends with a Moto Perpetuo. The instruments begin by dovetailing a single line which develops into two strands before a more violent section appears punctuated by strident doublestops. Both instruments have slightly manic solo episodes before the movement quickly dies away in the single line of its opening