Mathematics and Music
http://www.ams.org/publicoutreach/math-and-music
https://plus.maths.org/content/magical-mathematics-music
https://www.tandfonline.com/toc/tmaa20/current
http://www.claymath.org/millennium-problems
An Exploration of the Relationship between Mathematics and Music
https://humofmathematics.blogspot.com/
Home | Music Technology at MIT
Coding and Cryptography
http://www.mathematica-journal.com/
https://www.springer.com/mathematics/journal/283
https://www.iacr.org/
Some interesting blogs
https://blog.tanyakhovanova.com