Generate a Jam

Play → Jam Session → Generate Jam skips picking a song entirely: it synthesizes an endless 12-bar rhythm section on the spot, with separate bass, drum, and chordal-comping stems, so you can jam without needing any existing content.

The band marks the ends of each four-bar phrase with short drum pickups and uses the final bar for a bass-and-drum turnaround into the next chorus. These variations leave the next downbeat and the harmonica register clear. Across four choruses, the arrangement grows from a sparse opening to a fuller third chorus, then relaxes before beginning the arc again. Small timing and touch differences keep the players from landing like one machine, while the downbeats and bar lengths remain locked together. Restart replays the same performance; starting a new jam creates a fresh variation. Use Band energy to make that arc quieter and roomier or denser and more assertive. It changes accompaniment density and dynamics without changing the tempo or chord progression.

Before starting, pick:

• Key — a dropdown of all twelve chromatic keys.
• Progression — Standard (I-I-I-I-IV-IV-I-I-V-IV-I-V, the classic 12-bar form), Quick Change (moves to the IV a bar early), Minor Blues (the i/iv chords become minor), or Jazz Blues (a ii-V-I cadence in the last few bars).
• Band energy — Low, Medium, or High accompaniment density and dynamics. It does not alter tempo or harmony.
• Position — which cross-harp position to play in: 1st (straight harp, same key as the jam), 2nd (cross harp, the classic blues choice — a harp a fourth below the jam key), or 3rd (a harp a whole step below).
• Scale — the note palette used by the live hole guide.
• Genre — Blues, Jazz, Rock, Reggae, or Country. Each changes the bass pattern, drum pocket, comping rhythm, and instrument tone.
• Tempo — type a BPM value directly (60–160; out-of-range or non-numeric input is clamped/corrected once you press Enter or click away).

Click Start Jam and you’re straight into an ordinary Jam Session — the same calm form display and optional Guides, just with a generated backing instead of a real song’s. It keeps playing across backing-buffer boundaries automatically; the chorus/bar readout remains continuous. Choose End after this chorus to stop at the next 12-bar boundary with a two-beat tonic hit from the whole rhythm section. Muted stems stay muted for that ending. Restart returns to the count-in and chorus 1; Quit Song returns to this setup page (with your setup choices remembered), not the song list, since there was never a song list involved. The stem buttons let you mute Bass, Drums, or Comping independently without disturbing the timing of the others.