Now that's a double entendre for putting bars on the page
He said he wrote a “script” which is a type of writing and the bars are the blue lines of the paper. Since he is writing on the lyrics on the paper in other words he is literally trapped in the music.
He continues with prison like imagery by saying bars on the page.
1. Each line within the rap. True 16 from his brother Sez
2. Blues lines on the page look like a cage.
3. Bars for a prison cell
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