Uncertainty4 is the 19th release, 18th album-a-day and first harpsichord concerto by electronic music (and classical) composer Adhesion. In addition, being the fourth in the Uncertainty series, it is a deaf ear album meaning that it was written without being listened to at all (with final mixing/mastering done after listening). The music of this release, written for 3 harpsichords and strings, is primarily baroque-oriented with a strong sense of rhythm but also contains elements of minimalism and serialism. The result is a pastiche of various styles melded into a unique whole while still being unmistakably Adhesion.