|Sofia Gubaidulina in 1955, student at the Moscow Conservatory|
The earliest piece which Gubaidulina includes on her list of compositions is the Chaconne for piano, written in 1962. I think it is worth listening to and luckily, we have a clip with the score:
Without doing any analysis (perhaps I will delve into it at a later date) the obvious stylistic affinities are to Bach and Shostakovich (who loved to use passacaglia form in some movements). In places there is a powerful rhythmic energy. Harmonically the dissonance of the opening chords is not continued throughout, but alternates with a more crystalline transparency. I think what gives the music interest and strength is the fact that the textures are in such flux. There is a lot of variety in the piece. Gubaidulina is a very intuitive composer who avoids an excessively cerebral approach and I think this piece demonstrates that.