Lyric discussion by FUCKINGBULLSHIT 

it's about a girl who doesn't keep promises. "I can take him to your house but I can't unlock it; you see, you forgot to leave me with the key." This means she might have said it but she can't come through and actually do it. "..looking at your yellow railroad/in the ruins of your balcony." The ruins of the balcony represent BROKEN promises. "I'm just sitting here, beating on my trumpet/with all these promises you left for me." This one's obvious.

Marie can't keep her word, that's really all I got from it. And this song really started making sense to me after my girlfriend broke all her promises...hmm.

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