"Yesterday talks about how the good ol' days weren't quite as good as we remember them. It also has a line about history repeating itself 'the future has been rehearsed.'"
"I think the song means that you should not live with your head always in the past. It also means to live and 'don't be scared to look behind.' It's about balance and keeping your feet in the present, while not forgetting the past or shunning the future."