metrical-levels · ellis2007-beat-tracking-dp

In each of these examples, the subject tapping data could be clustered into two groups, corresponding to slower and faster levels of the metrical hierarchy of the music, which were separated by a ratio of 2 or 3 [...] Because of the multiplicity of metrical levels reflected in the ground-truth data (as noted in section 3.2), it is not possible for any beat tracker to score close to 100% agreement with this data.