Two short lines, and a lot is packed into them. The speaker hears a song, and it instantly reminds them of someone, "you." That sounds like it could be sweet, the kind of moment where music brings back a good memory. But the second line cuts that off: "Not in a good way though."
The "though" matters. It feels like a quick correction, almost as if the speaker started to say something tender and then caught themselves. The tone is flat and understated, and that restraint makes the feeling seem real. The speaker doesn't explain what went wrong or describe any hurt directly. We're left to guess, which suggests the memory is still uncomfortable, maybe too raw to talk about.
The title, "playlist," adds a small twist. A playlist is something personal, built from moods and memories, so the poem hints that music can carry painful associations as easily as happy ones. The mood is quiet, wry, and a little bitter.