Edit MP3 and/or WAV Metadata Tags?

Can Hazel edit MP3 metadata tags? I produce a weekly radio show, and I get sent music by the record labels and by independent artists. I want to populate the Custom 1, 2, and 3 and Comment fields in the MP3 metadata with data that helps me organize the library. Ideally, I'd do it as a watched folder scenario: I drop a file into a particular folder, Hazel watches that folder, sets the metadata accordingly, and then moves the file to my music server on the network.

Watched folders and moving files I'm good with. I'm stuck on how to change the MP3 and/or WAV metadata, though. Help would be appreciated

Hazel does not have built-in functions for that. You'll need to use an external program for that. Search the forums as other users might already have posted scripts.