Lay out a Sunday slot by slot, with tags and mashups suggested at each seam and the clock running.
A Sunday is five positions: the exhortation that opens the room, three song slots, and the transition that hands the room to the message. Drop a song into each, and the seams between them are scored for you — a tag that can be called on the spot, or a mashup worth building weeks ahead. The clock runs alongside, against a target body length, with a guardrail for when a set has more mashups in it than a congregation can follow.
Keys are the other half. Every song carries the keys this team actually plays, so a slot that drifts three semitones from the one before it says so before Sunday rather than during it.
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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