@hackage billboard-parser1.0.0.1

We present a parser for the world famous Billboard dataset containing the chord transcriptions of over 1000 professional chord transcriptions of popular music randomly selected from Billboard magazine's ``Hot 100'' chart between 1958 and 1991, all time-aligned with audio.

See: W. Bas de Haas and John Ashley Burgoyne, Parsing the Billboard Chord Transcriptions, Technical Report UU-CS-2012-018, Department of Information and Computing Sciences, Utrecht University, 2012. (http://www.cs.uu.nl/research/techreps/repo/CS-2012/2012-018.pdf)

And: John Ashley Burgoyne, Jonathan Wild, Ichiro Fujinaga, An Expert Ground-Truth Set for Audio Chord Recognition and Music Analysis, In: Proceedings of International Conference on Music Information Retrieval, 2011. (http://ismir2011.ismir.net/papers/OS8-1.pdf)