The Billboard Book of Top 40 Hits is an indispenable reference book and I have used the previous editions for years in my profession as a D.J. This reference covers the variety of charts and is exceptionally easy to use. I like the fact that it is cross-referenced by artist, song title, and year. It continually builds my knowledge of music, settles trivia debates, and answers all musical queeries. It has also kept so many songs from becoming lost to the new sounds/songs being produced every day. I refer to it as the bible of the industry, and have worn the covers off every single edition. If you want to be a part of the music field, then make this the very first edition in your music reference library. You will be surprised how much you learn, and you will also be reminded of so much that you have forgotten. It will make you smarter in the music field, and will bring back so many memories lost.