Nainggolan, O. T. P., A. N. Machfazia, F. Tyasrinestu, Djohan, and P. Sittiprapaporn. “Sibelius As a Tool to Improve Student’s Ability of Making Counterpoint Melody”. Journal of Web Engineering, vol. 20, no. 8, Nov. 2021, pp. 2361-90, doi:10.13052/jwe1540-9589.2087.