ChordNote — the chord and sheet-music platform 10 million people play from
Built to withstand heavy traffic — the chord-delivery platform rebuilt. Five instruments × copyright management × multi-channel billing on one platform.
music content distributor — Phase 2 rebuilt an existing large-scale chord service: reads distributed across replicas, copyright (JASRAC/NexTone) management automated, web and in-app billing unified, and chord display for five instruments — guitar, bass, piano, ukulele and more — consolidated onto one platform.
500K+
Songs available
Across artists
5 instruments
Chords supported
Guitar to ukulele
10M+
Monthly users
Traffic resilience
Challenge
Before
The existing foundation could not keep up with user growth: slow responses at peak, copyright work locked in individuals and a lopsided billing channel all held expansion back.
Database reads hit their limit at peak
Pages render slowly under load
Copyright (JASRAC/NexTone) managed by hand
Song registration took enormous effort
Web-only billing misses app members
Lost revenue opportunities
Chord display built separately per instrument
Maintenance and new features were inefficient
Solution
After
Reads spread horizontally across master/slave replicas, copyright imported automatically by a Laravel CMS with a Redis queue, multi-channel billing via Stripe and Apple IAP, and unified chord rendering for five instruments — all on one platform, migrated with zero downtime.
chordnote.example.jp / song
Chord chart view — transpose, capo and auto-scroll while you play
