By ShinobiTools Team · Last updated: July 2026
Upload a song and pull the bass line out as its own clean track — to learn it, transcribe it or sample it — with every other instrument separated too. Free, no account.
Split your track free →Bass is one of the cleanest stems Demucs produces, so you can finally hear exactly what the bassist is playing instead of guessing under the kick. StemGrab isolates it into its own MP3, along with the drums, vocals and everything else from the same upload.
Once you've got the bass on its own, mute it and play along to the rest, or solo it to learn every note. Our practise any instrument with stems guide walks through both. Want a different instrument? Remove or isolate the drums uses the same one-upload flow.
Vocals, drums and bass come out remarkably clean on most modern, well-mixed tracks. Guitar and piano are newer, experimental stems and can be rougher, especially in dense mixes; lo-fi, live or heavily reverbed recordings are harder for any tool. Give the tricky ones a listen before you build on them.
Working out a bass line from a full mix is mostly guesswork, because the kick drum sits on top of the bass in exactly the range you're straining to hear, and cheap speakers roll off the bottom two octaves entirely. Isolating the bass removes the guessing: you hear the actual notes, the actual slides, and the ghost notes that get buried under a snare on the record.
Start with the two numbers StemGrab shows next to the stems. The key tells you the root, which narrows the note choices from twelve to about seven before you've played anything, and it instantly explains why a line "sounds wrong" when you've been reading it in the wrong key. The tempo matters because the honest way to learn a fast line is to slow it down: any free audio editor or phone app will play a file at 70% speed without changing the pitch, and knowing the original BPM tells you what you're working back up to.
Then listen for the things a mix hides. Slides and glissandi between notes are usually inaudible in a full mix and obvious in isolation. So is note length, which is most of what makes a bass line feel like funk rather than a sequence of correct pitches. And on fingerstyle playing you can often hear where the player muted a string, which tells you the fingering as much as the notes do.
Bass is one of the cleanest stems Demucs produces, but there are three predictable failure modes and all three are physics rather than bugs. Kick and sub-bass overlap. On modern productions, especially hip-hop and electronic music, the kick drum and the bass note occupy nearly the same frequencies, so a low sustained 808 sometimes lands partly in the drum stem and partly in the bass stem. If a note sounds shorter than it should, mute the drums as well and you'll hear the rest of it.
Synth bass with a bright edge can be split: the fundamental goes to the bass stem while the buzzy top of the waveform gets read as a synth and lands in "other". The line is still perfectly learnable, it just sounds duller than the record. And upright bass in jazz recordings is the hardest case, because the bow and finger noise share a lot with the room and the cymbals; expect the isolated part to be usable for transcription but not for sampling.
Use the mixer to work around all of this instead of re-uploading. Solo the bass to transcribe, then un-mute the drums to check your timing against the kick, then download selected to take just the bass and drum stems as a practice loop. That two-stem version, bass plus drums with nothing else, is the most useful practice file the tool produces and it costs you nothing extra.
Yes — the bass comes out as its own MP3, separated from the drums and the rest of the mix. It's one of the cleaner stems on most tracks.
StemGrab gives you the isolated bass file; slow it down or loop sections in any audio player or DAW that supports tempo change.
Seven per song: vocals, drums, bass, guitar, piano, other, and a mixed instrumental (everything except the vocals), all as 192 kbps MP3 plus a zip of the lot.
No. Your upload is deleted the moment it's processed and the stems are wiped from the server within 45 minutes. Nothing is stored, shared or used to train anything — see privacy.