Allain Gaussin: Les céphéides, trio for violin, cello and piano - AL 30 735 For more than forty years, Allain Gaussin, fascinated by astrophysics, has found a major source of inspiration in observing the cosmos, as attest a number of works going from Vent solaire (1974) to Philae (2015), by way of LHarmonie des sphères (2006). Ten years later, the 'Messiaen du Pays de la Meije' Festival hosted the first performance of the piano trio Les Céphéides. The musical journey enables the listener to enter a space 'just as impalpable and fragile' as that in which moves each Cepheid variable  this star whose brightness varies over regular periods according to two elements: the diameter of the heavenly body and the temperature reading of its surface.