Applescript to open Get Info box for the previous iTunes track?

I like having a hotkey to bring up the get info box for the current iTunes track so that if I'm using another app and a song comes up, I can quickly edit it. This works (though if it's not the best way, please let me know):

tell application "iTunes"
    activate
    reveal current track
end tell
tell application "System Events"
    tell process "iTunes"
        key code 34 using command down
    end tell
end tell

I've assigned that a hotkey in BetterTouchTool and it's great.

I'd like to have a version of that script to edit the previous song... but changing "current track" to "previous track" causes a completely different result. iTunes goes back to play the previous track again even though I only told it to reveal it, and then I get an error saying applescript can't continue reveal.

tell application "iTunes"
    activate
    reveal (previous track)
end tell

What's the easiest way to get iTunes to show the previous track in a playlist using Applescript?