Lyric discussion by Larrow 

I agree with FeelingGroovy but i don't deny the possiblity of it being a girlfriend.

Wikipedia says that this is a coversong of George Gershwin's "Summertime" and that it's about a guy who feels imprisoned by his girlfriend through her infidelities

We probably won't ever know Brad's connection or inspiration to cover this song, but its a safe to say it was about his girlfriend or his addiction

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