In terms of the classification of 'rare', as in the other thread, I just took it to mean songs which hadn't been played much in a few years. To me the word rare means something along the lines of "once in a while" but the songs that you listed would be more a case of "hardly ever". If a song is played at <10% of shows on a given tour then I'd call it rare. A song which was played a lot on a tour but then hardly at all on the next tour might be classed as rare.