I.O.I (아이오아이) – '갑자기 (Suddenly)' (Official Music Video) guitar chords
Auto-generated chord chart from YouTube analysis
About Tutti
Tutti is a free tool that analyzes a YouTube link or audio/video file to detect the key, tempo (BPM), time signature and chord progression, then builds guitar chord charts and TAB. Results are shown with a playback cursor so you can play along.
A chord progression lists the chords in the order they change. At each chord name (e.g. G, Em, C), fret that chord and strum in time.
Guitar chord chart for I.O.I (아이오아이) – '갑자기 (Suddenly)' (Official Music Video). Tutti analyzed the YouTube audio to extract key D# Major, 115 BPM. a progression of 14 chords. Check the progression, each chord's notes and practice tips, then play along with the cursor in the Tutti app.
Song notes
“I.O.I (아이오아이) – '갑자기 (Suddenly)' (Official Music Video)” runs at 115 BPM in 4/4, in D# Major. The chart spans 95 bars and uses 14 distinct chords, changing roughly every 3.0 seconds.
14 of the chords need a barre (A#, A#7, C#, Cm, Cm7, D#, D#7, D#maj7, F7, Fm, Fm7, G#, Gm, Gm7), so this sits at a upper-int. level.
With a capo on fret 3 you can play it with G · G7 · A# · Am · Am7 · C … shapes instead — 13 of 14 become open chords.
Start around 81 BPM with a metronome and work up to 115.
The pulse holds within ±5.2 BPM, so it tracks a metronome well.
Dynamic range is 24 dB — a moderate swing between soft and loud passages.
The first chord lands at 2s, so there is a short intro before you come in.
Balance of the mix: Bass 40%, Drums 25%, Vocals 22%.
The vocal sits between A♯3 and D♯5 (centred on F4), which helps if you are picking a key to sing in.
Song structure
| Part | Starts | Bars | Plays | Progression |
|---|---|---|---|---|
| Part A | 0:01 | 1–4 | 2 | D# → D# → D# → Cm |
| Part B | 0:09 | 5–12 | 3 | G# → D# → D# → Cm → Cm → G# → D# → D#7 |
| Part C | 0:26 | 13–20 | 2 | G# → Fm7 → Gm7 → G# → G# → Fm → Gm7 → Gm |
| Part A | 0:42 | 21–24 | 2 | G# → D# → D# → D# → Cm |
| Part D | 0:50 | 25–28 | 2 | Cm → Fm → Fm → A# |
| Part E | 0:59 | 29–32 | 1 | A# → D# → D# → Cm |
| Part D | 1:07 | 33–36 | 2 | Cm → Fm → Fm → A# |
| Part F | 1:15 | 37–40 | 3 | A# → A# → D# → D#maj7 → D#maj7 |
| Part G | 1:23 | 41–44 | 1 | Cm → Cm7 → Cm → Cm → Gm → D#maj7 → D#maj7 → F7 |
| Part H | 1:31 | 45–48 | 1 | Cm → Cm → Gm → Fm7 → Gm7 |
| Part I | 1:40 | 49–52 | 1 | G# → G# → Fm → Fm → Gm → D# |
| Part J | 1:48 | 53–56 | 1 | G# → D# → D# → D# |
★ most repeated — likely the chorus
Practice tips
- Around 115 BPM. Practice to a metronome for steady timing.
- 14 chords are used. Loop the sections where chords change quickly.
- This song is in D# Major; practicing other songs in the same key builds your chord sense.
Chords used & their notes (fingering reference)
The Roman numeral on each chord shows its function relative to the key, revealing the harmonic flow.
Chord progression
