Mary Hammond has helped everyone from Adele to Cruz Beckham to sing better. Coldplay’s Chris Martin and Yungblud, among others, tell Patrick Smith what makes her so special – ‘The bigger you get, the more truth you need to hear’ Get the inside track from Roisin O'Connor with our free weekly music newsletter Now Hear This Get our free music newsletter Now Hear This Get our free music newsletter Now Hear This Email * SIGN UP I would like to be emailed about offers, events and updates from The