The audio is in British/english so it has limited use. However, the units are laid out in a sequential order that makes sense and can be adapted to a variety of activities.
Very good book and audio for everyone who wants to learn step by step the British accent, which differ quite heavily from his american counterpart.
Basically, as in music and classical canto, one learn to pronounce exactly the vowels, diphthongs and the tonality and thus gaining a new accent and tonality, which is very forward in the mouth. Also the tonality is with more pauses and besides the most important words are highlighted in pronunciation.