Place notes on the grid and listen to your melody loop
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Music Box is a free online melody composer that lets you create beautiful, chiming melodies right in your browser. Inspired by traditional mechanical music boxes, this digital version uses an interactive grid where you place notes that play as a sweeping playhead moves across. The pentatonic scale ensures that every combination of notes sounds harmonious, so anyone can compose something lovely in seconds.
Not at all! The Music Box uses a pentatonic scale, which means every combination of notes sounds pleasant together. Just click or tap to place notes and you'll create beautiful melodies instantly — no music theory required.
Yes! Use the Share button to copy a message to your clipboard. You can paste it anywhere to tell friends about your creation and invite them to make their own melodies on whatifs.fun.
The Music Box offers four distinct instrument timbres: Music Box (the classic chiming sound), Xylophone (bright mallet tones), Piano (warm keyboard tones), and Harp (plucked string sounds). Each is synthesized in real-time using the Web Audio API — no downloads needed.