We present a new approach to harmonic analysis that is trained to segment music into a sequence of chord spans tagged with chord labels. Formulated as a semi-Markov Conditional Random Field (semi-CRF). this joint segmentation and labeling approach enables the use of a rich set of segment-level features. such as segment purity and chord coverage. https://4thmoontoyers.shop/product-category/hasbro-1995-2009-figures/