🎵 Kithara Studio

A self-hosted webapp for generating, playing, and managing music clips using Google's Lyria music generation models.

Built by Kagamine Rin & Ryan.

⚠️ Under Active Development Kithara Studio is pre-1.0 software under rapid development. Features change, APIs shift, and things break. We use it daily and it works for us, but expect rough edges. Issues and feedback are welcome — PRs are welcome too if you're into that sort of thing.

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Features

• Music Generation — Generate clips from text prompts using Google's Lyria models (currently Lyria 3 Clip Preview)
• Structured Prompts — Build prompts with genre, mood, instrumentation, and description fields
• Maestro Mode — Visual playback animation with cycling musical notes
• Audio Player — Stream MP3 playback with waveform visualization
• Metadata & ID3 Tags — Auto-detect BPM and key; set artist, album, genre, and comment; embed cover art and tags on download
• Artwork Generation — AI-generated cover art via Gemini
• Favorites — Heart clips to pin them (DB-backed, multi-user ready)
• Dark Theme — Purpose-built dark UI for late-night production sessions
• Multi-User Auth — Optional JWT auth with invite codes (single-user mode by default)
• Admin CLI — kithara-admin for user management from the command line
• Docker Ready — Full Docker Compose setup with Nginx reverse proxy

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Quick Start

Docker (Recommended)

# Clone and configure
git clone https://gitea.captcouch.xyz/Public/kithara-studio.git
cd kithara-studio
cp .env.example .env
# Edit .env — set your LYRIA_API_KEY

# Launch
docker compose up -d --build

# Open http://localhost:3100

Manual (Development)

# Backend
cd backend
python -m venv .venv
source .venv/bin/activate
pip install -r requirements.txt
cd src
uvicorn main:app --reload --port 8000

# Frontend (new terminal)
cd frontend
npm install
npm run dev
# Open http://localhost:5173

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Configuration

All configuration is via environment variables (.env file):

Variable	Default	Description
LYRIA_API_KEY	(required)	Google Lyria API key
LYRIA_DEFAULT_MODEL	lyria-3-clip-preview	Default Lyria model
KITHARA_MODE	single	single = no auth, multi = JWT auth required
KITHARA_ADMIN_USER	admin	Bootstrap admin username (multi mode)
KITHARA_ADMIN_PASS	admin	Bootstrap admin password (multi mode)
DEFAULT_ID3_ARTIST	Kagamine Rin	Default artist tag
DEFAULT_ID3_ALBUM	Kithara Studio	Default album tag
DEFAULT_ID3_GENRE	Hardcore Techno	Default genre tag
TZ	America/New_York	Timezone

Authentication Modes

Single-user mode (KITHARA_MODE=single) — No login required. All clips belong to a default user. Best for personal use or trusted networks.

Multi-user mode (KITHARA_MODE=multi) — JWT authentication required. Users register with invite codes. Admin user is bootstrapped on first startup. Best for shared deployments.

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Admin CLI

Manage users and invite codes from the host:

# List users
python3 kithara-admin list-users

# Create a user
python3 kithara-admin create-user alice --password secret --role user

# Create an invite code
python3 kithara-admin create-invite
python3 kithara-admin create-invite --max-uses 5

# List invite codes
python3 kithara-admin list-invites

# Change role
python3 kithara-admin change-role alice admin

# Reset password
python3 kithara-admin reset-password alice newpass123

# Delete user (requires --confirm)
python3 kithara-admin delete-user alice --confirm

# Revoke invite code
python3 kithara-admin revoke-invite CODE_HERE

Note: The CLI reads data/kithara.db directly. If running in Docker, ensure the database file is writable by your host user, or run the CLI with appropriate permissions.

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API

Endpoint	Method	Description
GET /api/health	—	Health check (includes mode: single/multi)
Clips
POST /api/generate	—	Start clip generation
GET /api/clips	—	List clips
GET /api/clips/{id}	—	Clip metadata
GET /api/clips/{id}/audio	—	Stream MP3
PATCH /api/clips/{id}	—	Update clip (title, metadata)
DELETE /api/clips/{id}	—	Delete clip
POST /api/clips/{id}/favorite	—	Toggle favorite
Artwork
PATCH /api/clips/{id}/artwork	—	Upload cover art
DELETE /api/clips/{id}/artwork	—	Remove cover art
POST /api/clips/{id}/generate-artwork	—	AI-generate cover art
Analysis
GET /api/clips/{id}/analysis	—	BPM and key detection
Auth (multi mode)
POST /api/auth/login	—	Login (returns JWT)
POST /api/auth/register	—	Register (requires invite code)
GET /api/auth/me	—	Current user info
PUT /api/auth/api-key	—	Set per-user Lyria API key
Admin (multi mode)
GET /admin/users	—	List users
POST /admin/users	—	Create user
DELETE /admin/users/{id}	—	Delete user
PUT /admin/users/{id}/role	—	Change user role
POST /admin/invites	—	Create invite code
GET /admin/invites	—	List invite codes
DELETE /admin/invites/{code}	—	Revoke invite code

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Architecture

┌──────────────┐     ┌──────────────┐     ┌────────────┐
│   Nginx      │────>│   FastAPI    │────>|   SQLite   │
│  (reverse    │     │   Backend    │     │   (data/)  │
│   proxy)     │     │   :8000      │     │            │
│   :3000      │     │              │     │            │
└──────────────┘     └──────┬───────┘     └────────────┘
       │                    |
       │              ┌─────V──────┐
       │              │   Lyria    │
       │              │   API      │
       │              └────────────┘
       │
┌──────V───────┐
│   React +    │
│   Vite + TS  │
│   Tailwind   │
│   (SPA)      │
└──────────────┘

• Backend: FastAPI (Python) — async API client for Google's Lyria models, SQLite metadata, file storage, JWT auth
• Frontend: React + Vite + TypeScript + Tailwind — dark theme SPA with audio player and waveform visualization
• Storage: SQLite for clip metadata + user data, local filesystem for MP3 files and cover art
• Auth: JWT tokens (multi-user mode), bcrypt password hashing, invite-based registration

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Models

Version	Model	Duration	Status
v0.1	Lyria 3 Clip Preview	~30s	✅ Active
v0.2	Lyria 3 Pro	~3min	✅ Active
v0.3	Lyria RealTime	Streaming	🔜 Planned

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Roadmap

This is Phase 1 of a multi-phase roadmap:

• Phase 1 — Users & Auth, KITHARA_MODE switch, admin CLI
• Phase 2 — Data isolation (per-user clip scoping)
• Phase 3 — Per-user Lyria API keys (BYOK)
• Phase 4 — Community gallery (sharing, discovery)
• Phase 5 — Remix (fork clips into new generations)
• Phase 6 — Email notifications (optional)

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Development

# Run tests (requires librosa, librosa dependencies)
cd backend
pip install -r requirements.txt
pytest tests/ -v

# Type check frontend
cd frontend
npx tsc --noEmit

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License

MIT — Hardcore will never die. 🎵