Alvin Lucier’s work has been more often described in terms of science than of art and his scores often contain experimental procedures. Lucier perfectly represents the fusion of a scientist with an artist. His pieces arise from an inspection of a pure physical phenomenon. The performers on Mode’s fourth disc of Lucier’s music are the Italian experimental music ensemble Alter Ego- two of the works were written for or dedicated to them- and Alvin Lucier himself. The interaction of electronic and acoustic sounds is the central point of Two Circles. These electronic sounds move from the same note in two glissandi, ascending and descending. The acoustic instruments interfere, generating beating from the interaction of closed frequencies. In some cases, these pulsations give the impression to expand the sonic space, whilst in others they appear to bring to an ending. The work is receiving here its first recording.