Somehow the old 60s songs don’t work anymore, because they’re so…old. Or something.
Well, fear not, there’s something they now can sing (besides inane chants and droning a repeat of what every speaker says), from Reason.tv (they have full lyrics, so print them up on whatever tree bark is handy);
h/t ColdWarrior and Revo formerly http://therealrevo.com/blog/?p=57696
