The more things seem to change, the more they stay the same
Oh, don't you hesitate
They are trying to say things may be going fast but always try to risk something because it could possibly make your life better. This part means take risks.
They are not used to feeling these good moods they are used to bad luck, but this summer everyone seems happy and that stuff usually doesn't happen in the community they live in which makes them really happy.
They think this is going to be a pretty good summer and they are usually not looking forward to it, but they are now for some reason they just have a hunch and know this is going to be a long summer.
Three little birds, sat on my window.
And they told me I don't need to worry
They have a fantasy about birds, and and they are basically telling themselves not to worry, and to calm down because they are stressed out about something.