Philip Glass is one of the most influential and polarising composers of the last 50 years. His trademark sound is repetitive, rhythmic and hypnotic - some call it musical minimalism. Stephen Sackur asked what music meant to him.
You can watch the full interview on BBC World News on Monday 7 May at 03:30, 08:30, 15:30 and 20:30 GMT and on the BBC News Channel on Monday 7 May at 04:30 BST and Tuesday 8 May at 00:30 BST.
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