Adele is back, in case anyone has failed to notice. After a three-year absence, the BRIT school graduate sang a tentative “Hello, it’s me” on her comeback single and clocked up a million digital sales and a billion video hits in a week. Her previous album, 21, sold over 30 million copies, the only release this century to scale such dizzy heights. This is another great album full of heartfelt songs delivered with a warm, powerful voice that makes us want to sing along, punch the air and shed a tear. Adele’s voice has never sounded more certain, more prominent, more dominating. In other words, 25 is everything one might ask of mainstream adult pop, except maybe surprising and exciting.