SonataSeed

Choose a musical character, key, meter, length and accompaniment, then select Generate. SonataSeed builds the harmony first, creates a left-hand accompaniment, and then grows a melody constrained by scale, chord, phrase and melodic-motion rules.

• New Variation preserves the current settings and changes only the seed.
• Save Piece stores the complete composition in this browser. JSON export creates a portable SonataSeed project.
• MIDI creates a Type 1 file with separate right- and left-hand tracks.
• MusicXML creates an editable grand-staff score for compatible notation software.
• Print produces a clean score directly from the same note data used for playback.
• Tap Play once to enable browser audio. Headphones or external speakers improve the piano-like sound.

Keyboard shortcuts: Space plays or pauses; Escape stops playback.