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Lessong
Lessong is a command-line tool that turns any song into a language listening lesson with spoken lines and translations.
Lessong is a command-line tool that converts songs into language lessons. Inspired by a 90s radio segment, it automates vocal separation using Demucs, transcription and text-to-speech using ElevenLabs, and translation and structure analysis using OpenAI. Users provide a song file in formats like mp3, mp4, or wav, along with an ElevenLabs API key and an OpenAI API key. The tool splits the song into vocal and instrumental tracks, matches lyrics from lrclib.net or a custom file, structures the lesson by verse and chorus, finds an instrumental loop, and renders a synchronized audio or video lesson. It caches stages for fast editing and re-rendering, and runs on macOS on Apple silicon and Linux.
Lessong at a glance
- Best for: Student
- Runs on: macOS, Linux, CLI
- Pricing: Free
- Released: October 2026
- Category: AI research tool
- Website: github.com/eschnou/lessong
Key features
- Isolates vocals and instrumentals using Demucs
- Transcribes isolated vocals with ElevenLabs Scribe
- Matches lyrics from lrclib.net or custom lyric files
- Analyzes song structure and translates text with OpenAI
- Finds and loops voice-free instrumental stretches
- Renders beat-aligned audio and video lessons
- Caches each pipeline stage for quick re-renders
Use it for
- Learning a foreign language from favorite pop songs
- Creating custom audio lessons from local music files
- Generating video language lessons with synchronized lyrics
Alternatives to Lessong
- OnKey — It learns melodies directly from existing music apps without requiring manual note charts.
- Overview — Learn language models by running hands-on experiments without writing scripts
- Subturtle — Practice saved phrases out loud with an AI voice coach and smart review flashcards.
- Learnharness — It plans lessons from your current understanding to your goal using AI agents.
- RainbowSay — Listens to your favorite media to provide real-time translation, vocabulary, and grammar.
- GetYouTubeText — Extracts YouTube transcripts instantly with no sign up or paywall.
- Youtube Video Transcriber — Transcribes and translates YouTube videos locally with AI summaries and fact-checking.
- 4ToSpeak — Practice real speaking skills through a guided four-step sentence loop.
- Claudemy — Builds custom audio courses from web research and expert writing.
- DocTree — Generates source-grounded learning articles adapted to your expertise and time
- Teachoo — Guides students step by step with hints rather than giving direct answers.
- Transformer Explainer — Visualizes internal Transformer operations and next-token prediction in real time.
All Lessong alternatives