🎵 Sound Library
Ready-made letter melodies and ambient background music. Every sound is synthesized in real-time by the Web Audio API — no audio files, zero copyright. Click play to preview, open in sequencer to remix, or download as WAV.
Free Letter Melodies & Background Music
Every track in this library is aletter melody— a sequence of letters (A–Z) where each letter maps to a musical note. The audio you hear issynthesized live in your browserby the Web Audio API the moment you press play. There are no recorded samples, no downloadable audio files hosted on a server, and thereforezero copyright risk. All sounds are free for commercial use, including games, videos, podcasts, livestreams, apps, and installations.
Open Any Sound in the Letter Sequencer
Each card has a"Open in Sequencer"button. It loads the exact melody into ourLetter Sequencerso you can inspect every note, change the tempo (BPM), swap the waveform (sine, triangle, square, sawtooth), switch the musical scale (pentatonic, major, minor, blues, japanese, chromatic), add more tracks, and share your remixed version with a single link.
What You Can Do
- Preview online— click the play button, the melody is synthesized instantly.
- Download WAV— export a 44.1 kHz, 16-bit lossless file, ready for Unity, Unreal, Godot, FMOD, Wwise, or any DAW.
- Remix in Sequencer— open the melody, edit notes, change parameters, layer up to 8 tracks.
- Free for commercial use— no attribution required, no sign-up, no payment.
Categories
The library spans many moods and use cases:demo melodies(Hello World),lullabies & classics(Twinkle, Ode to Joy, Happy Birthday),ambient & backgrounddrones for focus and meditation,game & UIloops,ethnic scales(Japanese sakura, blues), and more. New sounds are added regularly.
How the Synthesis Works
Each letter is mapped to a frequency and a waveform type. For example, the letterhplays a 440 Hz sawtooth wave, whileaplays a 220 Hz sine wave. The sequencer schedules each note with an attack-decay-sustain-release (ADSR) envelope, producing musical phrases from plain text — a fun and copyright-safe way to generate background music.