Can I let others add songs to my playlist?

Greetings, deuptyvanhalen.

I see that you're wondering whether another person can add music to a playlist you're sharing through Apple Music. According to this Apple Recommended post, apparently it's not available.

Family shared playlist all members can add to? -- Even though your question doesn't include "Family Sharing", a playlist created and shared by someone doesn't allow for any music to be added to the playlist they've created.

Take care!