It doesn’t take too long to realise why Italian composer Giacinto Scelsi was the key influence on the spectralist composers; his attention to the detail and activity of sound makes him a key precursor to their own interests. To that end, many Scelsi compositions have something to offer to listeners who want to dig into the pre-history of spectralism. This disc has always made for a good case, though, particularly Quattro Pezzi Per Orchestra, which begins by oscillating the orchestra around one note, teasing out the multiple implications of its myopic focus, the better to get a sense of the immensities held within its singularity.