Yesterday I promised a thread on producer tags in #kpop songs, so I'm going to make this post and dump a ton of links in the replies so I can set them unlisted and hopefully make this less spammy possibly.
So what are producer tags? They are a small audio clip that a producer will tuck into the song, usually near the beginning. It's sort of like an artist adding their signature to a painting. Some producers do it, some don't.
Below are some examples. Feel free to ask questions in replies.