ClassicalPlayer will ask for access to your music library, so it can present your library's contents to you and play music.
You can report a problem with ClassicalPlayer's recognition of pieces from track titles. You do that with the "Mail Titles" button on the Info view. This drafts a mail message to the developer with an attachment that consists of the titles of your albums and their tracks: only that information. You can examine that attachment if you wish. Sending the mail message is under your control.