I have just started playing the piano again after nearly 50 years. I wanted a theory book that reminded me about key signatures, note names etc. This book explains everything in a really good way and I have learnt things that I never realised before. I think if I had had this book when I was having piano lessons all those years ago it would have made it all so much easier. I loved the book so much I bought a second one for my daughter who has not played the piano for 30 years so I hope she also finds it useful.