1. A computer-implemented method for matching audio sequences, the method performed by a computer processor and comprising: deriving, by the computer processor, a first probability density function P M outputting a probability that an initial correspondence score for a pair of chroma vectors of an audio sequence indicates a semantic correspondence between the chroma vectors; deriving, by the computer processor, a second probability density function P R outputting a probability that the initial correspondence score for a pair of chroma vectors of an audio sequence indicates that the chroma vectors have a random correspondence, the deriving of P R comprising: randomly selecting a set of pairs of audio sequences; deriving initial correspondence scores for the set of pairs of audio sequences; and fitting the initial correspondence scores to a probability distribution; deriving, by the computer processorusing P M and P R , a match function indicating whether a given pair of chroma vectors of an audio sequence correspond semantically; obtaining a first audio sequence; comparing, by the computer processorusing the match function, the first audio sequence with a plurality of known audio sequences; and based on the comparing, identifying, by the computer processor, a best-matching audio sequence for the first audio sequence from the known audio sequences.