Removing hidden file attribute for multiple files at once

I recently found my old iPod classic, and was able to copy all of the music files to my MacBook. However, all the files copied over as hidden. I was able to use the Cmd Shift . Feature to view them.

i also used chflags in terminal to remove the hidden attribute from the various folders themselves, however each individual file is also hidden. Short of doing chflags for each file (over 800), is there a way to do all at once? Or even all of the files in a particular folder at once?