Since then, he has also written for Eminem, The Wanted, Celine Dion, Cliff Richard, Ronan Keating, Diana Ross, Westlife, Boyzone, Cher, Johnny Hallyday, and Queen. These writing credits include Celine Dion's "Think Twice" (1994), which reached number one in the charts of Belgium, Denmark, Ireland, Netherlands, Norway, Sweden and the United Kingdom. In the UK, the song topped the chart for seven weeks in 1995, and went on to sell over a million copies. It remains Hill's biggest hit to date. He subsequently wrote "Call the Man" for Celine Dion's album Falling into You which, with sales in excess of 32 million, is one of the biggest selling albums of all time. He also gained success in the US, when he partnered with Peter Cetera for his "World Falling Down" album. From this, the single "Restless Heart" reached number 1 on the Adult Contemporary Chart for 10 consecutive weeks.