Unauthorized music files in iTunes Media folder

I have checked my purchase history and all of this music does not appear, I cannot open any of these tracks in iTunes to see who the purchaser is/was. I believe my account systems are pretty secure with 2FA, etc... but I am very worried about how all of this extra music got here... artists of which I have never heard of

[Edited by Moderator]

Original Title: I have just found hundreds of 'protected' & HLS items which are not mine in my iTunes Media folder!