Stems

In-Depth Explanation

Stems are stereo audio files containing sub-mixes of related instrument groups, exported from a DAW session. A standard pop song might produce four to eight stems: drums, bass, instruments, lead vocals, and background vocals. When all stems play back together at unity gain (0 dB), they reconstruct the final stereo mix exactly.

How Stems Work

Stems are created by routing individual tracks in a DAW into group buses (also called subgroups or stem buses), then exporting each bus as a standalone stereo file. Each stem contains all the processing, effects, and automation applied to that group during the mix.

A typical stem set for a pop song includes:

• Drums Stem: All kicks, snares, hi-hats, cymbals, and percussion mixed together into one stereo file.
• Bass Stem: Synth bass, bass guitar, and 808s combined.
• Instruments Stem: Guitars, pianos, synthesizers, and any other melodic elements.
• Lead Vocal Stem: The main vocal with all reverb, delay, and tuning effects printed in.
• Background Vocal Stem: Harmonies, doubles, and ad-libs.

Stems are not the same as multitracks. Multitracks (also called trackouts) are the raw, individual audio files for every single element in the session. A complex pop song might have 120 multitracks (Kick In, Kick Out, Snare Top, Snare Bottom, Guitar Left, Guitar Right, Lead Vocal Take 1, and so on). Stems are pre-mixed groupings. If a song has 15 drum tracks, the Drum Stem is one stereo file containing the final mixed sound of all 15 tracks combined.

When a producer asks you to "send the stems" so they can mix from scratch, they almost always mean multitracks. True stems are used for mastering, remixing, live performance, and sync licensing, not for mixing from the ground up.

Real-World Example

A music supervisor licenses your song for a Netflix drama. The scene opens with an argument between two characters, then transitions into an emotional montage. The supervisor requests stems so they can control which elements play during each moment.

During the dialogue, they mute the Lead Vocal Stem and play only the Instruments Stem and Bass Stem as background score. When the actors stop talking and the montage begins, they bring the Lead Vocal Stem back in. The song now fits perfectly around the scene without the vocals fighting the dialogue.

This is standard practice in 2026. Netflix and other streaming platforms now regularly require stems as part of their delivery specs. Without stems, the supervisor would have to use the full stereo mix and simply lower its volume during dialogue, which sounds far less professional.

Why It Matters for Independent Artists

Always export and archive stems before closing a project in your DAW. If a music supervisor wants to license your track and asks for stems, you need to deliver them within 24 to 48 hours. Telling them you lost the session files means they will move on to another artist.

Having stems ready also opens doors to Dolby Atmos and spatial audio mixing. Apple Music now streams spatial audio to all subscribers by default, and major labels regularly require both stereo and Atmos masters for new releases. Atmos mixing relies on stems to place individual elements in three-dimensional space. If your stems are organized and clearly labeled, an Atmos engineer can deliver an immersive mix faster and at lower cost.

Export stems at the same sample rate and bit depth as your final mix (typically 24-bit, 44.1 kHz or higher). Name them clearly: 01_Drums.wav, 02_Bass.wav, 03_Instruments.wav, 04_LeadVocal.wav. Store them alongside your multitracks in a dedicated folder for every release.

Read our guide on stem mastering to learn when stems improve the mastering process, and check our spatial audio guide to understand how stems feed into immersive formats.

Related Terms

• DAW (Digital Audio Workstation)
• Mastering
• Sync License
• Dolby Atmos
• Spatial Audio