About: Berlin vol: 2 was really good. About: Berlin vol: 3 was good. But about: berlin vol: 4 is absolutely outrageous! The CD makes at the first track in a good mood. And running through all the tracks. The items are matched to one another super. The composition of Beat, text and special sounds is made just right for my taste. The beats are totally catchy tunes, the text is perfect to sometimes sing it but not too much. And the choice of the particular sounds that makes the difference to the 'mainstream'. The sound quality is very good also as its predecessors.