a method for performing audio copy detection , comprising , providing a query audio data , the query audio data having a succession of frames and also providing a plurality of test audio data units , each test audio data unit including a succession of frames . for each test audio data unit the method generates a test fingerprint set . the generation of the test fingerprint test including computing similarity measurements between at least one frame of the test audio data and a plurality of frames of the query audio data . a test audio data unit is then selected as a match for the query audio data at least in part on the basis of the fingerprint sets .