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Coinciding with Radio 3's 'Light in the Darkness' season, Kate Molleson explores luminosity in music, among other topics, with the Australian composer Liza Lim. Clarinettist Kate Romano reflects on what was supposed to be a year of musical activity to mark the 250th anniversary of Beethoven's birth, and reassess the figure of the composer in light of this year's curtailed celebrations. We hear from celebrated violinist Hilary Hahn and the roboticist and expert on Artificial Intelligence Carol Reiley, who've just launched DeepMusic.AI - an initiative directed towards professional artists and musicians which is designed to enhance their creative processes. And, Kate is joined by the Revd. Lucy Winkett to review the new book 'Arvo Pärt: Sounding the Sacred' - a collection of essays exploring the spiritual dimension of the celebrated Estonian composer and how his music has been represented by society.