@article{hong2017an, title = {An Analysis of Low-Arousal Piano Music Ratings to Uncover What Makes Calm and Sad Music So Difficult to Distinguish in Music Emotion Recognition}, author = {Hong, Yu and Chau, Chuck-Jee and Horner, Andrew}, journal = {J. Audio Eng. Soc}, volume = {65}, number = {4}, pages = {304--320}, year = {2017}, url = {https://www.aes.org/e-lib/browse.cfm?elib=18563} }