How to Make a Bassline for Your Beat That Fits Your Chords

Your chords are in, your drums are rolling, but your beat still feels empty. Chances are the bassline is missing, or it isn't working with the rest. Making a bassline sounds hard, but most of the work comes down to a few simple rules. Here's how to write a bass that fits your chords and makes your beat move.

The short answer

• Start with the root notes of your chords. For Am, F, C, G you play A, F, C and G.
• Lock the bass in with your kick, so the low end sounds like one thing.
• Only then add variation: an octave jump, the fifth or a passing note into the next chord.
• Stay in key and keep it simple. A good bassline is often something you only notice when it's gone.

What does a bassline actually do?

The bass does two jobs at once. It sits under your chords, so you can hear which chord is playing. And it's part of your rhythm, together with the kick. A bassline that plays the right notes but isn't in the groove sounds stiff. A bassline with a great rhythm but the wrong notes sounds out of tune. You need both.

In trap and drill, the bass is usually an 808. In house, afro or R&B it's more often a synth bass or a bass guitar sound. The rules below work for all of them. Want to know what an 808 is first? Read what is an 808.

Step 1: find the key and the chords

You build a bassline on top of your chords. Already know your chords? Great. Working from a sample or a loop? Find the key first. Drop your sample into the free Beat Lab and you'll see the key and BPM right away. More ways are in how to find the key of a song.

Which chords belong to that key is explained in which chords go together. The examples below use A minor with the chords Am, F, C and G, one chord per bar.

Step 2: play the root notes

The root note is the note the chord is named after. Am has root A, F has root F, and so on. In your piano roll, put the root of each chord on the first beat of its bar, low on the keyboard. Done: you have a bassline.

That sounds too simple, but plenty of beats don't do much more than this. It keeps your low end tight and makes sure your bass never clashes with the chords. Always start here, and only add things after.

Quick start: with the free chord progression generator you pick a mood and download a MIDI file with two tracks: the chords and a bass line on the root notes. Drag that bass track onto your 808 or synth bass and you have a base to build on straight away.

Step 3: give the bass a rhythm

Now it gets fun. One long note per bar works, but the groove comes from the rhythm.

• Follow your kick. Start the bass notes at the same moments as your kick. Together they sound like one big hit in the low end. It's the easiest way to make a bassline sound tight.
• Play between the kicks. A short bass note just after the kick or on the offbeat adds bounce. You hear that a lot in house and afro.
• Pick long or short. Long notes feel heavy and calm. Short notes feel tight and danceable. Mix them: one long note at the start of the bar, a few short ones at the end.

Using an 808 in trap or drill? Then you often don't let the 808 land with every kick, so they stay out of each other's way. How to handle that is in how to mix 808 and kick.

Step 4: add variation with octaves, fifths and passing notes

Rhythm locked in? Then you can make the bassline more interesting without it sounding off. Three safe tricks:

The octave

Play the same note an octave higher, short, then go back down. It's still the root, so it always fits. It adds a lot of movement and it's a classic in disco, house and drill.

The fifth

The fifth is the fifth note up from the root. For A that's E, for F it's C, for C it's G and for G it's D. That note is also in the chord, so it sounds stable. Switch between root and fifth and your bassline instantly gets more shape.

Passing notes into the next chord

At the end of the bar, play a short note that walks toward the next chord. From A to F you can go through G, for example. From F to C you walk down through E and D. Pick passing notes from the key and it'll almost always sound right. It tells the listener a new chord is coming.

Step 5: pick the right sound and range

• One bass at a time. Don't let two bass sounds play in the same low range, or your low end gets muddy. Want layers? Use a sub for the deep part and a second sound that only colors the higher part.
• Don't go too low. The lower the note, the less you hear it on small speakers. Move your bassline up an octave if it disappears on your phone. A bit of saturation helps too.
• Keep it mono. Keep stereo effects off your bass and keep it in the center. Read how to check your mix in mono if you're not sure.
• Glides in trap and drill. An 808 that slides into the next note gives you that recognizable sound. Here's how: how to make 808 glides in FL Studio. Does your 808 sound out of tune while you're playing the right notes? Then the sample itself is off. Read how to tune an 808 in FL Studio.

Make a bassline in 5 minutes: step by step

1. Find the key of your beat or sample.
2. Pick two to four chords, or download them with the chord progression generator.
3. Put the root of each chord on the first beat of the bar.
4. Start your bass notes where your kick lands, or right between the kicks.
5. Add one octave jump or fifth every two bars.
6. Put a passing note at the end of the bar before the chord change.
7. Listen on your headphones and on your phone, and move it an octave if needed.

Common mistakes

• Too many notes. A busy bassline gets in the way of your melody and your rapper. Less is often more.
• Notes outside the key. A wrong note sounds extra loud in the low end. Check your key.
• Bass and kick fighting. Let them land together or take turns, but not half on top of each other.
• Every bar the same, without a single surprise. Repetition is good, but a small variation at the end of four bars keeps it exciting.

Sounds to start with

A bassline is only as good as the sound you play it with. NAME The Trap Oneshot Pack Vol. 1 includes 26 808s and 20 kicks, among other sounds, all royalty-free. Want to build the rest of your beat too? Read how to make a melody for your beat. Rather start rapping on a finished beat? Browse all beats.

FAQ

Does my bassline always have to play the root note?

No, but it's the safest base. Start with the roots and move away from them with the fifth, the octave or passing notes. If you deliberately play a different note under a chord, the color of that chord changes. That can sound great, as long as you do it on purpose.

Is an 808 the same as a bassline?

In trap and drill the 808 usually plays the bassline. So an 808 is a sound, and the bassline is what you play with it. The same rules apply to a synth bass or a bass guitar.

How low should a bassline be?

Low enough to give your beat weight, but not so low that it disappears on small speakers. Always check your beat on your phone or earbuds too.

Can I make a bassline without music theory?

Yes. If you know which chords are playing, you can follow the root notes. The chord progression generator even gives you that bassline ready-made as MIDI.

More free help with your beats, like a BPM and key finder and a master checker? Check out all the free music tools.