Playback - April 20th

This week on Playback. Black holes in the Milky way. The dangers of recording sean-nós. And finally, justice for the 48 people unlawfully killed in the Stardust fire. All on Playback presented by Sinéad Mooney.

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Sinéad Mooney brings you the best of the week's wireless - from the big news stories to the features, drama, documentaries, sport and music.