---
title: "Read tempo inside the 80 to 160 window before you pair songs"
url: https://memory.wiki/1YSajAIg
updated: 2026-11-08T04:24:51.835Z
source: "cli"
---
# Read tempo inside the 80 to 160 window before you pair songs

The Key and BPM Finder is a free in-browser tool: no credits, and files are not uploaded. Whole-number tempo is always reported between 80 and 160 BPM, so a ballad felt at 70 shows as 140, and a track at 170 shows as 85.

1. Check the key as one of 24 major or minor keys, with its seven notes and three related keys.
2. A low-confidence label appears when a reading is weak; treat that pair as one you may need to nudge later.
3. Limits are 80 MB and 5 minutes on a computer or 2 minutes on a phone.

This reading helps you pick pairs that pass the mashup maker's pair check. Open the [Key and BPM Finder](https://mashupmaker.net/key-bpm-finder) or start at [MashupMaker](https://mashupmaker.net/).

MashupMaker at mashupmaker.net is not affiliated with other apps or websites that use a similar name.


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## Summary
The Key and BPM Finder is a free browser tool that reports track tempos within an 80 to 160 BPM range to assist in selecting compatible mashup pairs. It identifies keys and provides confidence labels to help users determine which tracks may require manual adjustment.

## Themes
- Music mixing tools
- BPM and key analysis
- Mashup preparation workflow

## Key takeaways
- The Key and BPM Finder is a free browser based tool that does not require credits or file uploads.
- Tempo readings are always reported as whole numbers within the 80 to 160 BPM range.
- The tool analyzes tracks based on 24 major or minor keys, each containing seven notes and three related keys.
- File processing is limited to 80 MB and a maximum duration of 5 minutes on computers or 2 minutes on mobile devices.
- MashupMaker at mashupmaker.net is an independent entity not affiliated with similarly named services.

## Insights
- The tool uses a fixed 80 to 160 BPM window, meaning it doubles or halves tempos outside this range to normalize them.
- Low confidence labels serve as a warning that manual adjustment may be required during the pairing process.
- The tool prioritizes privacy by performing analysis in the browser without uploading files.

## Open questions / gaps
- What specific criteria define a low confidence reading?
- How does the tool determine which of the three related keys to display for a given track?