This paper introduces a new corpus, CoCoPops: The Coordinated Corpus of Popular Musics. The corpus can be considered a “meta corpus” in that it both extends and combines two existing corpora—the widely-used McGill Bill- board corpus the and RS200 corpus. Both the McGill Billboard corpus and the RS200 contain expert harmonic annotations using different encoding schemes and each represent harmony in fundamentally different ways: Billboard using a root-quality representation and the RS200 using Roman numerals. By combining these corpora into a unified format, using the well-known kern andharm representations, we aim to facilitate research in computational musicology, which is frequently burdened by corpora spread across multiple encoding formats. The format will also facilitate cross-corpus comparison with the large body of existing works in **kern format. For a 100-song subset of the CoCoPops-Billboard collection, we also provide participant ratings of continuous valence and arousal ratings, along with the RMS (Root Mean Square) signal level and associated timestamps. In this paper we describe the corpus and the procedures used to create it.

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