Two songs in. One honest verdict out.
The mashup question, answered before you open a DAW: are the keys friends on the wheel, how far apart are the tempos, and is the gap bridgeable — straight, halftime, or not at all.
Nothing is uploaded — your audio never leaves your device.
| Key | Camelot | BPM | Confidence |
|---|
The verdict says 'compatible'. The console makes it true.
Detection guesses; blending proves. SongRemixer warps your pair to a shared grid with pitch and tempo decoupled — vocals of A over the beat of B, on beat, in key. Sign up: 3 full packs free.
What makes a mashup actually work
Key and tempo are the entry requirements this checker scores — but the third ingredient, arrangement space, is where great mashups live. A dense wall-of-sound instrumental fights any vocal you put over it; a beat with room in the midrange welcomes one. When the verdict here says "compatible," the next test is thirty seconds in headphones asking one question: is there a hole where the vocal wants to sit?
And the golden rule bears repeating: when keys need reconciling, move the instrumental. Shifted drums forgive; shifted voices tattle.
Frequently asked questions
How do I know if two songs will mix?
Three checks: keys within one Camelot step (or relative major/minor), tempos within about 8% of each other (after considering halftime), and — the one no tool measures — arrangements that leave each other room. This checker scores the first two and tells you the stretch the third would need.
What if the keys clash?
You have three outs: transpose one track (a semitone or two is invisible — our shifter does it), mix during percussive sections where key barely matters, or pick a different pairing. The verdict tells you how many semitones would reconcile them.
Why does the checker show confidence scores?
Because chromagram key detection and autocorrelation BPM are estimates — good ones, but estimates. Low confidence means verify by ear before building the mashup. The studio's engine digs deeper when it matters.
Does the vocal or the instrumental decide the key?
For a classic vocal-over-beat mashup, the acapella's key wins — shift the instrumental to meet it, never the vocal. Voices carry the most audible artifacts when shifted.