Timbral similarity measures basedon Mel-Frequency Cepstral Coefficients have been widely reported as the basis for a possible general music similarity function, which would have wide application to searching, browsing and recommendation. Many of the reported methods, however, have computational requirements that make them impractical for searching realistic collections using current hardware. We compare lightweight measures that appear to perform equally well, and introduce a simplification that reduces memory requirements and execution time by a further order of magnitude. This yields a similarity measure that will scale easily to large commercial collections. We give comparative results over two contrasting music collections, one of which has been widely studied, allowing direct comparison with previous work.
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