This script uses the UNIX qlmanage command to display a Quick Look window of the selected track(s), which can be audio, video, and, perhaps most usefully, PDF, whereby Preview.app is not necessary. Also handy for playing a single track out of playlist context. Need I add that a keyboard shortcut makes this very handy.
Caveats: 1) under Leopard a media file will begin playing immediately, so the script uses a hack to prevent this, 2) under Snow Leopard and better the QL window's title contains "[DEBUG]" which cannot be suppressed, and 3) the QL window can only be dismissed by clicking on its close box.
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downloaded 13m 28s ago
Gather audio tracks whose files contain no artwork metadata
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Renumber order of selected tracks
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Copy Artist to Album Artist of selected tracks
downloaded 22m 1s ago
Set choice of various number tags of selected tracks incrementally
downloaded 26m 34s ago
Append user-entered text to beginning or ending of selected tag of each selected track
downloaded 27m 11s ago
Delete characters from the beginning or ending of selected tracks' name, artist, album, comments, composer, or show tags