Fig. 3From: Sparse pursuit and dictionary learning for blind source separation in polyphonic music recordingsLog-frequency spectrograms of the beginning of the 1st mvt. of the sonata no. 1 for violin and piano by Johannes Brahms (op. 100). The grayscale axis is logarithmic and normalized to a dynamic range of 100 dB for each plot. Performance by Itzhak Perlman and Vladimir Ashkenazy. Remastered CD recording by EMI Classics, 1999Back to article page