  In this late-breaking abstract we propose a modified approach for beat
tracking evaluation which poses the problem in terms of the effort required to
transform a sequence of beat detections such that they maximise the well-known
F-measure calculation when compared to a sequence of ground truth annotations.
Central to our approach is the inclusion of a shifting operation conducted over
an additional, larger, tolerance window, which can substitute the combination
of insertions and deletions. We describe a straightforward calculation of
annotation efficiency and combine this with an informative visualisation which
can be of use for the qualitative evaluation of beat tracking systems. We make
our implementation and visualisation code freely available in a GitHub
repository.
