Banger Machine
Press Start. The page tries 2,400 patterns for each of eight instruments, keeps the one that fits the rules of the style best, then plays the winners. You hear the best pattern so far while it searches. In endless mode it rewrites one instrument every 8 bars, so the music keeps changing for as long as the page stays open.
Use headphones for the bass. On iPhone, switch silent mode off.
Key and chords
The search
Each dot is one pattern the search tried. The line is the best pattern so far. Higher means it fits the rules better.
The bar playing now
One bar of 16 steps. Stronger colour means a louder hit. The dashed row is being searched. Tap a name to see its rules. A tilde marks a wild-card pattern that bends the rules. Ambient plays without drums, so those rows show off.
The arrangement
Rules
Each rule gives a score from 0 to 100%. The fit is their weighted average.