The days of playing along
with pre-recorded phrases are over.

Experience the thrill of seemingly endless variations with the Genius Jamtracks trio right from your smartphone!


Genius Jazz Trio Sound

Dynamics, note durations, space and feel.
The Genius Jamtracks trio pays close attention to each of these elements to make the Genius Jam Session experience as close to the real thing as possible!


The Only Polyrhythmic play-along!

From the traditional comping of a standard play-along and common polyrhythms of the jazz vocabulary to more complex, challenging and sometimes superhuman rhythms, experiment with how the app transforms the rhythm according to the Rhythmic Complexity slider level.


A Real Swing Feel

Yes! Forget robotic triplets of other play-alongs.
By changing the tempo the app won’t simply play faster or slower, the swing feel will change as well. The Genius Jamtracks app learned how to swing by internalising the jazz vocabulary and playing based on real transcriptions from the masters.


The Reharmonization Department

From triads and jazz harmony to more complex chords and negative harmony.
Experiment with how the app reharmonizes each song according to the slider level.


Actual Voice Leading!

Whether you choose to adjust the level of harmonic complexity or just press play and trust the app to create your Genius Jam Session for you, you’ll always have the same attention to voice leading from the pianist and the same effort in creating beautiful lines from the bassist to accompany you.


Get Creative!

The jazz world is waiting for you! Create the new jazz standards of the next century. Why not?
Click on the Pencil icon and you’ll find a super useful interface to experiment with your compositions.

The Algorithm

We’ve designed our algorithm to think and play like an actual jazz trio.

Rather than the tedium of playing along with predictable, prerecorded phrases, now you can jump in on the instrument of your choice and experience the thrill of seemingly endless in a jam session right from your smartphone.

The Two Sliders

Harmonic Level

Adjust the range of harmonic level from simplifying the written chart up to complex reharmonizations.

When moved all the way to the left, you get triads. As you start moving to the right, you progress into jazz harmony and your choice for the range of jazz piano voicings will increase. The further you continue to the right, the more liberties and substitutions the band will make, as well as increasing the level of the harmonic content in the range of chords and negative harmony.

Whether you choose to adjust the harmonic level or just press play and trust Genius Jamtracks to create your Jam session for you, you’ll always have the same attention to voice leading from the pianist and the same effort in creating beautiful lines from the bassist to accompany you.

Rhythmic Level

When all the way to the left you will get a more traditional comping from the trio without the use of polyrhythms, much like a standard play-along.

As you start moving to the right, each instrument begins to introduce polyrhythmic phrases, and the further you go, the more complex the rhythms get and the longer they last.

The Two Modes

Jam Session
When in Jam Session Mode, The GJT trio decides on their own what to play and when to play it, based on the style of the song and the tempo.
The basic function is pretty simple. Using the two sliders you can adjust the session to your desired level.
The polyrhythmic content will start from simple dotted quarter notes and progress to more complex ones like triplets in groups of 17.

If you want to focus on a specific ratio, grouping, or displacement, you can ask the trio (by individual instrument or all three) to do this, so that when they choose to introduce polyrhythmic phrasing it will include only what you requested.

As you won’t know when or how it will be used though, this feature also helps sharpen your ability to improvise as well as mastering that rhythm.

The Harmonic Level slider is still fully customizable in this mode.

  • Groupings: All subdivision groupings up to 17.
  • Ratios: Starting from simple ratios, like 2:3 and 3:4, and going up to more complex stuff.
  • Other: Half time, double time, anticipation, dotted quarter notes, half note triplets, and more.

The Six Buttons

By changing the tempo in either mode, you will also affect the choice of polyrhythms the trio will use.
The Genius Jamtracks trio won’t simply play faster or slower, the style will change as well, depending on the tempo.
The polyrhythmic content available depends upon where the tempo is set.

Choose the key you want to practice each song in. Your last preference for a song in each Jamsession will be saved for the next time you return to it.

Once you press play, you will hear a count off and the trio will start. Press again to stop.

Select the number of choruses you want to play with the trio in your Jam Session.

Customize the instrument levels and metronome volume.

Choose Yes/No to decide whether to play the first chorus as a head. When “Yes” is selected, the GJT trio will play in a more conservative way through the head of the song before letting loose in the solo section.

Instrument Transpose
Here you can transpose the chord chart for any of the songs in the app to the pitch that corresponds with your instrument and save this as the default way to display the chords on your device so you won’t need to adjust it every time.

Create ~ Edit Songs

Create your own songs with Genius Jamtracks using an easy and intuitive interface. Get creative and listen to how your compositions swing with the Genius Jamtracks trio.

Edit the charts for your favorite jazz standards however you like. Change chords, style add accents, and overwrite or save new versions of the songs in your library.


Create as many playlists as you want and save your favorite songs for easy access.
Go to the playlist tab press the “+” button, select the songs you want to add in, and done!

Follow Thembie and go through the app features.

 UI walkthrough


 In action