Does anyone here use Dropbox to trade music files (or other files)? I keep getting messages on my computer that files are being added to my dropbox account, but I'm not adding them. WTF?

The files are mp3 files by Lana Del Rey. I have no idea who she is or where these files are coming from. I'm afraid to click on one. Each file appears to have her latest album cover attached.

Can anyone help explain this?