Q: I don't remember hiding music.

I was looking through my iTunes account and saw a category labeled hidden purchases.  I opened it up and found hundreds of songs and albums.  I looked up hidden purchases and it says you choose to hide purchases.  I haven't ever intentionally hidden music since I'm the only one it's for, why would I hide it from myself.  If I didn't do it why would there be hundreds of songs in the listing.  I signed up for apple music, would that have done it?  I'm a little (lot) concerned about this.  iTunes is quirky, but.....