This question has two answers because there are two completely different things happening, and almost every argument about it is two people describing different ones.
Attached audio versus baked-in audio
When you pick a song from the app's audio library, the track is attached as a separate object. The platform knows exactly which recording it is, it has an agreement with the rights holder covering that use, and the song gets a page that other people can post to. Nothing is being detected, because nothing needs to be.
When you edit elsewhere and upload a finished file, the music is part of the video's audio track. Now the platform has to identify it, and content-matching systems are very good at that. What happens next is up to the rights holder's policy for that recording in that territory.
| Added in-app | Baked into an upload | |
|---|---|---|
| How the platform sees it | A licensed track, by ID | An audio fingerprint to match |
| Typical outcome | Plays | Plays, is muted, or is blocked in some countries |
| Available catalogue | Large on personal accounts | Whatever you have rights to |
| Business or creator accounts | Smaller, commercial-use catalogue | Same as anyone |
| Can you cut to the beat | Only by eye, after the fact | Yes — the audio is in the edit |
The problem this creates for beat-matched editing
Cutting to a beat means the audio has to exist in the edit. That is not a preference — the cut points are positions in a waveform, so there has to be a waveform. Which puts anyone editing properly on the wrong side of the line above.
There is a workaround people try: edit to the track, export the video silent, upload it, and add the same song in-app. It occasionally works and usually does not. The in-app track starts wherever the platform's trimmer starts, your edit was cut to a specific bar, and the two drift apart by a quarter of a second — which, on a video where every cut is supposed to land on a drum, is the difference between deliberate and broken. Why reels look amateur has this at the top of the list.
The reliable answer is duller and better: cut to music you are allowed to publish.
What the licence words actually mean
| Term | What it means | What it does not mean |
|---|---|---|
| Royalty-free | No per-use payment after the licence | Free of charge, or free of terms |
| Copyright-free | Usually marketing language | That nobody owns it |
| Public domain | Copyright has expired | That a specific recording is free — the performance may still be owned |
| Creative Commons | Free under stated conditions | No attribution needed, or commercial use allowed |
| Commercial licence | You may use it in monetised content | You may resell the track itself |
The distinction that catches people is the last row of the public-domain entry. A Chopin nocturne is out of copyright; the 2019 recording of somebody playing it is not.
Where to get music you can cut to
- Meta Sound Collection. Free tracks intended for use on Meta platforms, downloadable as files — which is the important part, because a file is something you can put in an edit and cut against.
- YouTube Audio Library. Same idea, same practical benefit: you get the audio, not a reference to it.
- Subscription libraries — Epidemic Sound, Artlist, Uppbeat, Soundstripe. A monthly fee, a large catalogue, and a licence that covers commercial use. Most also whitelist your accounts so the matching system knows you are allowed.
- Per-track marketplaces — AudioJungle and similar. Cheap once, and worth it if you use one track across a whole campaign.
- Commissioned or your own. The only option nobody can change the terms of later.
Choosing a track that is actually cuttable
Licensing aside, library music varies enormously in how well it takes a beat-matched edit, and the difference is audible.
- A clear transient. A kick or a snare with a hard attack gives a detector something unambiguous to find. Pads, swells and ambient washes do not — see beat detection explained.
- A steady tempo. Programmed drums beat a live band for this, because a detector faithfully reports a drummer who drags.
- Structure inside 30 seconds. You need an intro, a build and a drop within the length you are actually posting — how long a reel should be.
- A tempo that suits the footage. 120 BPM gives 60 beats in thirty seconds; 174 gives 87, and shots of a third of a second each. How many cuts a reel should have is the arithmetic.
The practical position
- Editing in-app, personal account, no monetisation: the audio library is there and it is licensed. Use it.
- Editing anywhere else, or running a business or client account: use a track you hold a licence for, and keep the licence.
- Cut the edit to that track, with the audio in the timeline, so the cuts land where the drums are.
- Upload the finished file with its own audio. Nothing to match, nothing to mute, nothing to re-sync.
In Easy Reels the track goes into the media library like any other asset, the beats come off the waveform, and the same song can carry a whole month of videos — which is the other reason to license properly. A licensed track you reuse forty times costs almost nothing per video; a trending sound you cannot legally bake in costs you the edit.