For macOS 10.10 and later only. This stay-open applet runs alongside iTunes and detects when library tracks have been selected and then displays a heirarchical list of the playlists containing the selected track(s) (a live-updating version of iTunes' "Show In Playlist"). Can also be set to monitor only playing tracks. Clicking a playlist in the list selects it in iTunes--and if a single track had been selected then it will be selected in the chosen playlist. Additionally, the monitoring routine can be toggled off temporarily so that the current list of playlists remains fixed yet still selectable.
The playlist containing the current track selection is colored blue.
(via in-app purchase)
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Move selected playlists to a new or existing folder