Here’s something a lot of young producers and musicians find out the hard way: there’s no magic “three seconds is fine” rule. No free pass for tiny clips. The U.S. Copyright Office is clear — there’s no hard minimum amount of music you can use without permission. Even one beat. Even a half-second melody. If it came from someone else’s recording, you need to ask first.
And it’s not just one person you have to ask — it’s two. When you sample a song, you’re actually touching two separate things: the composition (the underlying melody and lyrics, owned by the songwriter or their publisher) and the sound recording (the actual recorded audio, owned by the artist or — very often — their record label). Those are different copyrights, held by different people. You need a green light from both.
Interpolation — where you re-record something that sounds like an existing song instead of lifting the original audio — still requires permission for the composition, even though you created new audio yourself. So remaking the melody doesn’t get you off the hook for the underlying music.
Note: these rules apply to copyrighted works. Music that has entered the public domain may be treated differently, but determining whether something is truly in the public domain can be complicated — when in doubt, check with a professional.
The simplest way to think about it: if you didn’t write it and you didn’t record it, you don’t own it. Get permission before you release, not after.