As you know, tunes may be in many playlists, so you'd have to display them all...

One thing you could do is remember the artist and title, or mark the track, then later go into JEmplode and toggle its colour, which would identify the playlist(s) it's in. You could even search for playlists containing marked tracks.
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Toby Speight
030103016 (80GB Mk2a, blue)
030102806 (0GB Mk2a, blue)