Sure.

01, "An association" is for something I associate with myself. This may be a concept, an object, an animal, a trope, or something else.
02, "Something of interest" is for either a fact about me or a thought about one of my interests. I will respond with either one depending on how I'm feeling.
03, "A memory" is for a source memory that I am willing to share.
04, "A melody" is simply just for a song that I like. You could probably just call it a song recommendation.

I hope this clears up any confusion you may have had. Send me another ask if I didn't answer your question properly.