Keys · 9A
What mixes with 9A?
9A is E minor. In Open Key notation it is 2m. These are the keys that sit well after it, from the safest move to the boldest.
Stay put
9A Em
Another track in the same key. Nothing can clash. The only risk is that an hour of one key starts to sound flat.
Perfect — one step round
The neighbours on the wheel. Six of the seven notes are shared with 9A, so a long blend holds together. This is the move to reach for when you want the change to go unnoticed.
Fuzzy — change of mode
9B is the relative major: the same seven notes as 9A with a different home note, so the mood turns without anything going sour. 8B and 10B are a step round as well as a change of mode. They usually work; listen to how the bass lines sit before you commit.
Boost — two or three steps up
An audible lift. Fewer notes are shared, so mix it quickly or bring it in over a breakdown rather than riding a long blend.
Drop — two or three steps down
The same distance the other way. It takes the tension out of a room, which is useful after a peak and unhelpful before one.
Mood — four steps
1A A♭m
A deliberate change of colour. Treat it as the start of a new chapter, not a blend.
A safe route out of 9A
9A → 10A → 10B → 11B → 11A
Every step there is either one place round the wheel or a switch between minor and major, so each change shares most of its notes with the one before. Five tracks later you are two positions on and nobody heard a join.
Everything else
Any key not listed above is a long way from 9A. That does not make it forbidden. It means the two tracks should not be heard together for long: cut, use a breakdown, or put a track from the lists above between them.
See it as a picture on the Mixkey wheel, or read harmonic mixing in plain words.
Tracks in 9A
See 37 tracks in 9A, each with its tempo, energy and what mixes out of it.