Sequenza VI is a composition for solo viola by Luciano Berio, part of his series of fourteen Sequenze.
Walter Trampler, for whom Chemins III was written, believed it had in fact been composed first and the Sequenza then extracted from it.
It does this in two ways: first, by implying harmonies with melodic lines circling continuously through a small number of fixed pitches and, second, by presenting long series of three- and four-part chords in which the pitches are kept sounding by means of across-the-strings tremolo.
The opening A section is an exposition dominated at first by the tremolando chords, but also using short melodic segments to articulate phrases and create internal fluctuations.
In a reversal of the process found in the exposition, the tremolando chords gradually increase in frequency over the B section.