The constant BIBTEX in the IRMAS dataset is missing a closing curly brace:
BIBTEX = """
@dataset{juan_j_bosch_2014_1290750,
author = {Juan J. Bosch and Ferdinand Fuhrmann and Perfecto Herrera},
title = {{IRMAS: a dataset for instrument recognition in musical audio signals}},
month = sep,
year = 2014,
publisher = {Zenodo},
version = {1.0},
doi = {10.5281/zenodo.1290750},
url = {https://doi.org/10.5281/zenodo.1290750}
"""
The constant BIBTEX in the IRMAS dataset is missing a closing curly brace: