What’s the Difference Between Mixing and Mastering?

This is probably the most common question I get from artists sending me their music: “Do I need mixing, mastering, or both?” It’s a fair question — and once you understand the difference, you’ll make much better decisions about how to finish your tracks.

Watch the video below for a quick overview, then read on for the full breakdown.

What Is Mixing?

Mixing is the process of taking all the individual tracks in your session — drums, bass, vocals, guitars, synths, effects — and blending them into a cohesive stereo file. It’s where the real shaping of a song happens.

During mixing, an engineer balances levels, pans instruments across the stereo field, applies reverb and effects, uses compression to control dynamics, and sculpts EQ to make every element sit properly. A great mix makes everything feel like it belongs together — nothing fights for space, every part supports the whole.

Think of it like directing an orchestra. Every musician might be playing perfectly on their own, but someone needs to make sure the trumpets don’t drown out the strings, the percussion drives the rhythm without overpowering the melody, and the vocals cut through with clarity. That’s what a mix engineer does.

What Is Mastering?

Mastering is the final step before distribution. You take the finished stereo mix and optimise it: adjusting overall EQ, applying subtle compression, controlling the stereo width, and bringing the loudness up to commercial standards. It’s also where you ensure the track translates well across different playback systems — from earbuds to club PA systems.

Mastering is more subtle than mixing. Where mixing involves dozens of individual decisions per track, mastering is about a handful of precise, high-level adjustments to the finished stereo file. A good mastering engineer can make a well-mixed track sound polished, punchy, and ready for Spotify, Apple Music, vinyl, or wherever it’s headed.

The Key Difference

Here’s the simplest way to think about it:

• Mixing = working with multiple individual tracks → creating one stereo file
• Mastering = working with one stereo file → making it release-ready

Mixing is surgery. Mastering is the final polish.

Do You Need Both?

Almost always, yes. If you’re sending separate instrument tracks (stems), you need mixing first. If you’ve already mixed your track and just need it brought up to release standard, you might only need mastering. But the two processes work together — a poor mix limits what mastering can achieve, and great mastering can’t fix fundamental balance problems.

If you’re unsure what your track needs, get in touch — I’m happy to listen and advise.

Learn Professional Mixing Techniques

If you want to understand the full mixing process from start to finish, my course The Official Guide to Mixing covers everything: gain staging, bus routing, EQ, compression, effects, and how to get your mixes sounding professional — even in a home studio.

For a broader view of music production from the ground up, check out the Music Producer Gold Guide.