HARMONICALLY-RELATED MUSICAL NOTES. This dataset contains 15 groups of four harmonically-related musical notes extracted from the RWC Musical Instrument Sound Database [1]. The instruments selected are: viola, violin, cello, piano, soprano sax, bassoon, flute, recorder, oboe, horn, alto sax, pipe organ, harp, trumpet, and clarinet. This tracks were used for evaluation of a multipitch estimator proposed in my PhD thesis [2], in Chapter 4, Section 4.4.3, on page 107. [1] M. Goto, H. Hashiguchi, T. Nishimura, and R. Oka, "RWC music database: music genre database and musical instrument sound database," in Proceedings of the 4th International Conference on Music Information Retrieval, pp. 229-230, 2003. [2] Delgado Castro, A. "Iterative separation of note events from single-channel polyphonic recordings". Ph.D. University of York. 2019.