Chain four or more songs into one climb: pick the seams, hold the meter, and print the result.
A mega mash is four or more songs joined seam by seam into one long climb, with no underscore to hide the joins. Every seam is a real object — a splice, a tag, a guitar solo, a drums-only bar, an underscore — and an exhortation rides on top of a song rather than sitting between two of them.
What holds a chain together is rarely a shared chord loop. It is meter, click and lyric, which is why the builder tracks all three across the whole chain rather than scoring each pair in isolation.
Every song section is reduced to a loose four-chord Nashville-number loop, so the tools can score which sections share a progression. Matching is approximate by design: fitting a section into four bars drops a 9th, a 7th, a passing chord — results tell you which chart to pull up next, not the exact phrasing. See a worked chain, or start from the Mashup & Tag Finder.
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