1. A computer-implemented method for matching audio sequences, the method comprising: deriving 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 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; deriving, using 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, using the match function, the first audio sequence with a plurality of known audio sequences; and based on the comparing, identifying a best-matching audio sequence for the first audio sequence from the known audio sequences.