Currently, it's not possible to exclude a type of song like that while searching, but a similar idea was created here. If you agree with the content in this Idea, I'd recommend you to add your vote there.
However, the way you mentioned is a little different(being able to exclude it while searching by using the "-" command), feel free to create a new Idea more detailed about your suggestion here. This will allow users, Stars, and Moderators to vote and comment on it.
Have a lovely day! 🙂
BruneliciaRock Star 11
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