This 53-CD set is more than the sum of its parts. While not all the performances and recordings are top-notch, the overall quality is very high and as a historical overview of a label known for its sonic as well as musical merits, it's full of treasures. The Mercury sound at its best is vivid and still sounds remarkable and many of these recordings - such as the marches, show tunes and orchestral showpieces conducted by Frederic Fennell - demonstrate this amply. But it's not all lollipops by any means.