Each box contains 25 slipcase CDs, a booklet (up to 186 pages) and an index. The booklets contain extensive notes (Eng/Fr) with recording dates and line-ups. 31 hours of music in each box, totalling 1677 tracks Each track has been restored and mastered from original sources. The only reason I can think of for there not yet being a review of these four boxed sets, is that those who own them are just too busy having one hell of a blast listening to them. Some people moan about the 50 year copyright law for audio recordings in Europe, but without it this highly entertaining, eye-opening and educational undertaking could never have taken place. These 100 discs (spread over four boxed sets of 25 discs) tell the story of jazz from 1898 to 1959.