Check if two songs mix (Camelot key, BPM), read shared song DNA reports, tempo and nightcore math.
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First seen 31 Oct 2026. One server, whatever directories list it: each directory listing keeps its own page and history.
1
Directories
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6
Tools
From an anonymous probe
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Tools
| Tool | Description | Behaviour |
|---|---|---|
| camelot | Gives the Camelot wheel code for a key and the three other keys that mix cleanly with it (one step either way with the same letter, and the relative major or minor). | Read-only |
| check_mix | Decides whether two songs will mix well, from their keys and BPMs, using the Camelot wheel and DJ tempo limits (about 3% sounds natural, up to about 16% is usable, half and double time count). Returns a verdict, the tempo change in percent and the target BPM for track B, the smallest key shift in semitones if the keys clash, and a link to make the matched audio. | Read-only |
| song_report | Reads the song DNA from a MusicMind report the person made on zeltorlabs.com and shared: key and Camelot code with the keys that mix with it, BPM, genre mix, section structure with energy, and production DNA (energy profile, mood, arrangement density, compression, biggest moments). Takes the share link (https://zeltorlabs.com/report/r/<code>) or its code. Use the key and BPM with check_mix to compare it with another song. If the person has no report yet, they can make one free at https://zeltorlabs.com/analyze (the audio is analyzed in their browser). | Read-only |
| speed_pitch | For a nightcore (faster and higher) or slowed (slower and lower) version: the pitch change in semitones for a speed, the new BPM if given, and typical settings. Defaults: nightcore 1.25x, slowed 0.80x. | Read-only |
| tempo_change | Percent change and playback rate to go from one BPM to another, how noticeable it will sound, the pitch change if it is not time-stretched, and the half and double time of the target. | Read-only |
| transpose | Moves a key up or down by semitones and gives the new key name and Camelot code, with a note on how natural the shift will sound. | Read-only |
| Directory | Listing | Tier | First seen |
|---|---|---|---|
| Official MCP Registry | Zeltor Music Tools | - | 31 Oct 2026 |