fnmatch not finding "&" character

I'm relatively new to Python, so sorry if I butcher any terms or make dumb questions. My goal here is to rename any filename in a specific directory containing the string "&" to an "x". So far I've tried making python look for these files and print their filenames but get back an empty output, even though there's a test file that contains the string "&".

Here is my code:

import fnmatch
import os

for file in os.listdir('B:\\Music'):
    if fnmatch.fnmatch(, '*&'):
        print(file)

import os

directory = 'B:\\Music'
for basename in os.listdir(directory):
    if '&' in basename:
        os.rename(
            os.path.join(directory, basename), 
            os.path.join(directory, basename.replace('&', 'x'))
        )

As I said in the main post comment, you don't need fnmatch, because you only wanted to tell if the basename contains &. Using in should be enough.

PS: Getting back to your title, you may refer to @adamgy's answer to get the correct way to use fnmatch to match something in the future.