As a staff writer for Tree Publishing (before it was Sony/Tree) in Nashville in the early '80's I became fairly proficient at the number system. There is no # above 7, as the numbers merely designate chords. The "7" chord is a half-step below the "1", for example "F#" in the key of "G", or "B" in the key of "C". In the original example, the number would have been written as a "2" with a smaller "7" to the right and slightly above or below the "2", hence the confusion. The bar designated as (2 5) is called a split bar. In a 4/4 time signature the "2" chord would get 2 beats and the "5" chord would get 2 beats. A "2-" is a "2 minor", or "A Minor" in the key of "G". A number with a small circle above and to the right of it is a diminished chord, and a number with a "+" above and to the right of it is an augmented chord. It's a great system, and very helpful if the singer's key has not been established yet, unlike musical notation which of course must specify a key.
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