The 1 is the key, which is to say, the lowest note played in the progression. If it's less than 25% then that means that 4-chord progressions frequently do not choose their minimum as the first note.
If you were a musician you'd know that in popular music the vast majority start on the 1 chord. Classical music probably does this less frequently, but it's nowhere around 1/5 of the time.
The 1 is the key, which is to say, the lowest note played in the progression. If it's less than 25% then that means that 4-chord progressions frequently do not choose their minimum as the first note.
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