AI Lyric Generator – Phantom Tone Custom GPT Lyric Engine
Overview
The Phantom Tone Custom GPT Lyric Engine is a fully specialized AI system designed to create Japanese lyrics with perfect rhythm, rhyme, and phonetic flow. It is not a generic text model — it is structured to simulate professional songwriting workflow for Suno AI and other music-generation systems.
Unlike typical lyric generators, this GPT operates through multi-step structured composition, ensuring that each lyric section (verse, chorus, bridge) aligns with the intended BPM and mora count. Its architecture is optimized for phonetic rhythm and emotional resonance, favoring the beauty of sound over literal meaning.
---System Workflow
Step 0 – Specification Gathering
Before generating lyrics, the AI automatically interviews the creator to capture all musical parameters:
- Song theme / atmosphere
- Number of chorus sections
- Presence of repeated parts
- Percentage of English lyrics
- Rhyme intensity (1–10 scale)
- BPM (numeric or qualitative)
- Vocal gender & tone (e.g., female airy / male powerful)
- Preferred instruments (koto, shakuhachi, guitar, etc.)
日本語仕様：
歌詞作成前に必ず仕様をヒアリングし、雰囲気・BPM・ボーカル特性・使用楽器などを確認。
これにより「音楽として気持ち良い言葉」を出力するための基盤を整える。
Step 1 – Kanji-mixed Lyric Generation
The AI then generates complete lyrics with kanji, respecting the following rules:
- Constructed as A-melo / B-melo / Chorus format
- Each section in Verse 2 is completely rewritten (no repetition)
- Mora count must remain within ±1 for rhythm stability
- Emphasis on sound flow, rhyme, and aesthetic phonetics rather than literal semantics
- Heavy use of rare and poetic Japanese words is encouraged
Example lines:
紫苑の栞に焼けい砂 照る琵琶橋 夜よる
夏葵の赤祈りに染めて 映ると幻揺れる揺れる
The AI also annotates structure using English headers compatible with Suno AI (e.g., [Verse 1], [Chorus], [Bridge]).
Step 2 – Romanization & Music Prompt Creation
Once the lyric content is confirmed, the system automatically converts it into romanized format following strict transliteration rules:
- へ = e, は = wa, を = o, ん = n
- English words are retained as-is
The final output includes two main components:
- [Lyrics Romanized] – ready for direct input into Suno AI
- [Style of Music] – a detailed text prompt describing genre, vocal style, tempo, and production mood
Example Output Format
[Lyrics JP] [Intro (koto) solo] [Verse 1] ... [Chorus] ... [Verse 2] ... [Outro] ... [Lyrics Romanized] [Intro (koto) solo] ... [Verse 1] ... [Chorus] ... [Verse 2] ... [Outro] ... [Style of Music] Japanese Hip Hop, J-Pop fusion, Female vocal, Fast-paced, Danceable, Heavy rhyme structure, Complex Japanese vocabulary, Magical, Ghostly theme, Inspired by Hyakki Yagyo folklore, Poetic lyrics, Use of traditional Japanese instruments (koto), Ethereal and elegant vibe.---
Philosophy
The Custom GPT prioritizes the “sonic beauty of Japanese” — rhythm, balance, and musicality of syllables — rather than grammatical or narrative logic. It reflects Phantom Tone’s creative vision: lyrics as living soundscapes.
日本語補足：
意味よりも響きを重視し、日本語のモーラ（拍）・韻律・難語を駆使して、
詩的で音楽的なテキストを生成することを目的とする。
Integration with Suno AI
This GPT is fully synchronized with Suno AI v5 for seamless text-to-music conversion. Together, they form the dual core of Phantom Tone’s AI composition system:
- Suno AI – 音を作るAI（Sound Generator）
- Custom GPT – 言葉を作るAI（Lyric Generator）
Future Development
We are planning a limited public beta where users can collaborate with the GPT to generate original Japanese lyrics. This project aims to open a new chapter of AI-assisted poetic expression under Phantom Tone.
Meta Info (SEO)
Title: AI Lyric Generator – Phantom Tone Custom GPT for Japanese Songwriting
Description: Explore how Phantom Tone’s Custom GPT creates advanced Japanese lyrics for AI-generated music. Built for Suno AI integration and poetic sound design.
Keywords: Custom GPT, AI lyrics, Japanese hip-hop, Suno AI v5, AI songwriting, AI music generator, Phantom Tone