lidify/docs/implementation-summaries/curated-vibe-mixes/IMPLEMENTATION.md

Curated Vibe Mixes Implementation

Overview

This update adds 19 new curated vibe mixes and a Mood-on-Demand feature that allows users to generate custom mixes based on audio features.

Bug Fix

Fixed the genres field bug - the Album model uses genres (JSON array) not genre (string). Added a helper function findTracksByGenrePatterns() that properly queries:

1. Track's lastfmTags and essentiaGenres (native String[] fields)
2. Falls back to filtering album.genres JSON array in application code

New Daily Vibe Mixes (10 tracks each)

Mix Name	Description	Key Audio Features
Sad Girl Sundays	Melancholic introspection	valence < 0.35, minor key, arousal < 0.4
Main Character Energy	You're the protagonist ✨	valence > 0.55, energy > 0.55, danceability > 0.5
Villain Era	Dark & empowering 😈	minor key, energy > 0.65, aggressive tags
3AM Thoughts	Late night overthinking 🌙	arousal < 0.35, energy < 0.45, valence < 0.45
Hot Girl Walk	Confident cardio 💅	danceability > 0.65, BPM 95-135, energy > 0.55
Rage Cleaning	Aggressive productivity 🔥	energy > 0.75, arousal > 0.65, BPM > 125
Golden Hour	Warm sunset vibes 🌅	valence > 0.45, acousticness > 0.35, energy 0.25-0.65
Shower Karaoke	Belters you can't help sing 🚿	instrumentalness < 0.35, energy > 0.55, valence > 0.45
In My Feelings	Let it all out 💔	valence < 0.4, arousal < 0.55, acousticness > 0.25
Midnight Drive	Late night cruising 🚗	energy 0.35-0.65, arousal 0.25-0.55, BPM 85-125
Coffee Shop Vibes	Cozy background ☕	acousticness > 0.4, energy 0.15-0.55
Romanticize Your Life	Aesthetic moments 🎬	valence 0.35-0.75, arousal 0.25-0.65, acousticness > 0.25
That Girl Era	Self-improvement mode 💪	valence > 0.55, energy > 0.45, danceability > 0.45
Unhinged	Embrace the chaos 🎪	Extreme features (high or low everything)

New Weekly Curated Mixes (20 tracks each)

Mix Name	Description	Algorithm
Deep Cuts	Hidden gems 💎	Tracks with zero or few plays
Key Journey	Harmonic progression 🎹	Ordered by circle of fifths
Tempo Flow	Energy arc 📈	slow → fast → slow BPM journey
Vocal Detox	Instrumental escape 🧘	instrumentalness > 0.75
Minor Key Mondays	All minor key bangers 🖤	keyScale = 'minor', energy > 0.45

Mood-on-Demand Feature

Backend Endpoints

• POST /api/mixes/mood - Generate a custom mix based on audio parameters
• GET /api/mixes/mood/presets - Get available mood presets for the UI

Preset Moods (12 total)

1. 😊 Happy & Upbeat
2. 😢 Melancholic
3. 😌 Chill & Relaxed
4. ⚡ High Energy
5. 🎯 Focus Mode
6. 💃 Dance Party
7. 🎸 Acoustic Vibes
8. 🖤 Dark & Moody
9. 💕 Romantic
10. 💪 Workout Beast
11. 😴 Sleep & Unwind
12. 👑 Confidence Boost

Custom Mix Builder

Users can adjust sliders for:

• Happiness (valence)
• Energy
• Danceability
• Tempo (BPM)

Frontend Changes

New Component: MoodMixer.tsx

A beautiful Spotify-esque modal with:

• Gradient preset cards with emojis
• Smooth animations (Framer Motion)
• Custom range slider controls
• Dark theme matching the app aesthetic

Homepage Integration

Added "Mood Mixer" button next to the "Refresh" button in the "Made For You" section.

Files Modified

Backend

• backend/src/services/programmaticPlaylists.ts - Added helper function, fixed 12 genre bugs, added 19 new mix generators
• backend/src/routes/mixes.ts - Added mood endpoints and presets

Frontend

• frontend/lib/api.ts - Added types and API methods for mood mixing
• frontend/app/page.tsx - Integrated MoodMixer modal
• frontend/components/MoodMixer.tsx - New component (created)

Technical Notes

• All mixes use Essentia audio analysis data (valence, energy, danceability, BPM, key, etc.)
• Fallback to Last.fm tags when audio analysis is insufficient
• Daily mixes: 10 tracks, refreshed daily
• Weekly mixes: 20 tracks, for longer listening sessions
• Mix generation is cached in Redis for performance