How to select certain multiple files in massive list?

So I have a massive file mp3 list (of about 10,000 songs) and I would like to select certain files but not all, so that I can import the same photo for certain songs, where is the option to select multiple files?

the only option I find is "Select All" but that is not what I want to do.

You can choose the files you want if you press CTRL and a mouse click.

Or you filter your list by pressing F3 and enter a value which all of your songs have in common, like the album name or an artist name.

Documentation about Filter.

Woohooo!!
Thank you so much!

Finally saved me hours or even days of just trying to add photos one by one using both methods!

thanks again!