Chord Lens
BASS LINES, BY EAR. for bass players
Hear the bass under the mix, follow the chords from the root, and slow the busy bars down. Start at 01 and work down.
01 / 04 · Your path
Beginner to advanced.
in this order ↓
- 01
Learn songs by ear
Learn songs by ear one short phrase at a time: slow it down, loop it, sing it, find it, and use stems to hear the part you play.
Beginner · 8 min · Slow Down Songs - 02
Find the chords
How to find the chords of a song: find the key, follow the bass, test major or minor, then check your chart against the record with AI YouTube to Chords.
Beginner · 8 min · AI YouTube to Chords - 03
Learn bass lines by ear
How to learn bass lines by ear: solo the bass stem, slow it down, loop a bar at a time, and find each note from the root of the chord above it.
Beginner · 8 min · Bass Stem Splitter - 04
Nashville numbers
The Nashville number system explained: chords as numbers in the key, minors, sevenths, slash chords and split bars, and how to see any song in numbers.
Intermediate · 8 min · AI YouTube to Chords
02 / 04 · More for bass
Every other bass guide.
- Bass · Beginner
Play bass from chords
How to play bass from chords: roots first, then fifths, octaves and approach notes, locked to the kick, with the chart in time and the bass stem muted.
8 min · Lyrics and Chords - Guitar · Bass · Piano · Intermediate
Slash chords
Slash chords explained by what the bass does: walking lines, pedal notes and colour notes, and how to hear and play the bass note on guitar, bass or piano.
9 min · Chord Shapes - Any instrument · Beginner
Find the key
How to find the key of a song by ear in five steps: hear the home note, test the chords, pick major or minor, then check it with Song Key Finder.
7 min · Song Key Finder - Any instrument · Intermediate
Transcribe a song
How to transcribe a song into a chord chart: set the key and tempo, map the form, count the bars, fill in the chords by ear, then check it at full speed.
8 min · AI YouTube Stem Splitter
Show all 28 bass guides
- Any instrument · Beginner
Chord progressions
Common chord progressions explained: I–V–vi–IV, I–IV–V, ii–V–I, the 12-bar blues and the minor ones, with the chords in C and G and how to hear them.
8 min · AI Chord Finder - Any instrument · Beginner
Transpose chords
How to transpose chords to another key: count the semitones, move every chord by the same amount, keep each chord’s quality, and spell it for the new key.
7 min · Change Song Key - Any instrument · Beginner
Major vs minor key
Major vs minor key, by ear: find the note that sounds like home, test its third, and tell a major key from its relative minor, which shares every note.
8 min · Song Key Finder - Any instrument · Beginner
Chord symbols explained
Chord symbols explained: what m, 7, maj7, sus2, sus4, add9, dim and slash chords mean, the notes in each, and the plain chord to play when one is hard.
9 min · Chord Shapes - Any instrument · Beginner
Worship guide tracks
What a worship guide track is: a voice that counts the band in and calls each section. How teams use one, and how to make one for any song.
9 min · Guide Track Maker - Any instrument · Beginner
Make a chord chart
How to make a chord chart your band can read: what goes on the page, which layout suits each player, and how to print one from any song’s recording.
9 min · Chord Lens Studio - Any instrument · Intermediate
Worship set planning
Worship set planning, song by song: pick a key the room can sing, print a chart the band can read, and add spoken cues so nobody misses a turn.
9 min · Guide Track Maker - Any instrument · Beginner
Chords on YouTube
Chords for YouTube, right on the video: the free Chord Lens Chrome extension shows each chord in time while YouTube plays, with the shape, key and stems.
8 min · Chord Lens for Chrome - Any instrument · Beginner
Count-ins and clicks
Practice with a metronome on a real song: a count-in before every section, a click on the band’s own beat, and entries that land on beat one every time.
8 min · Guide Track Maker - Any instrument · Beginner
Rehearse without a band
How to practice without a band: mute your own parts, let the original players fill the gaps, add spoken cues, and fill an empty chair at rehearsal.
8 min · Backing Track Maker - Any instrument · Beginner
Find the BPM
How to find the BPM of a song: count the beat against a clock, rule out half and double time, then check the tempo Chord Lens counts from the beats.
7 min · Song Key Finder - Any instrument · Beginner
Learn a song quickly
Learn a song quickly before rehearsal: map the sections, learn the chord loops, drill the two hard bars slower, set your key and print the chart, in 30 minutes.
8 min · Chord Lens Studio - Any instrument · Beginner
Slow down a song
How to slow down a song without changing its pitch: pick a speed, loop the hard bars, and step back up to full tempo, with the key held where the record has it.
7 min · Slow Down Songs - Any instrument · Beginner
Make a backing track
How to make a backing track from any song: split it into stems, mute the part you play, and play along with the original band, slowed down or in a new key.
7 min · Backing Track Maker - Any instrument · Beginner
Metronome for songs
A metronome for songs that follows the band: click on the record’s own beats, slow it down with the song, then fade the click until your time holds alone.
8 min · YouTube Metronome - Any instrument · Beginner
Chord app for your phone
Chord Lens as a chord app for iPhone and Android: add the Studio to your Home Screen from Safari or Chrome and practise any song’s chords on your phone.
7 min · AI YouTube to Chords - Any instrument · Beginner
Song structure
Song structure explained: intro, verse, chorus, bridge and outro, how to hear where each starts, and how to use a song map to learn a song faster.
8 min · Chord Lens Studio - Any instrument · Beginner
Chord Lens for Mac
Chord Lens for Mac, the chord app for Apple silicon Macs: download it, open it the first time, sign in, and turn your first song into chords and stems.
7 min · Chord Lens for Mac - Guitar · Bass · Ukulele · Any level
Chord Lens vs Ultimate Guitar
An Ultimate Guitar alternative for songs nobody has tabbed: Chord Lens reads the chords from the recording itself. Side by side, read from each site.
Checked Oct 2026 - Guitar · Bass · Piano · Ukulele · Any level
Chord Lens vs Chord ai
Looking for a Chord ai alternative? Chord Lens and Chord ai side by side: YouTube, microphone, stems, key, speed, apps and free plans, read from each site.
Checked Nov 2026 - Any instrument · Any level
Chord Lens vs Chordify
Looking for a Chordify alternative? Chord Lens and Chordify side by side: chords in time, key, speed, stems and plans, read from each site.
Checked Nov 2026 - Any instrument · Any level
Best chord finder apps in 2026
Best chord finder app for 2026? Chord Lens, Chordify, Moises, Chord ai, Anychord and Capo compared, plus Swaram, Audelta, ChordU and Chord Tracker.
Checked Nov 2026 - Any instrument · Any level
Chord Lens vs Moises
Looking for a Moises alternative? Chord Lens and Moises side by side: stems, chords, key, speed, apps and free plans, read from each site.
Checked Nov 2026 - Any instrument · Any level
Best stem splitters in 2026
Best stem splitter 2026? Chord Lens, Moises, LALAL.AI, Ultimate Vocal Remover and Fadr: free plans, downloads and chords, read from each site.
Checked Oct 2026
04 / 04 · Quick answers
Quick answers.
01Can I hear just the bass in a song?
Yes. The Bass Stem Splitter splits the song into stems, so you can solo the bass to hear the line under the mix, or mute it and play the part yourself.
02How do I find the bass notes from the chords?
Most bass lines land on the chord’s root at the start of each change. AI YouTube to Chords gives you the chords in time, and Chord Shapes draws each one on a bass neck with the root marked.
03Can I slow a bass line down without changing the pitch?
Yes. Slow Down Songs plays the song from quarter speed to double at the same pitch, and you can loop the bars you are learning.
04What does it mean when the band says “go to the 4”?
They are using the Nashville Number System: chords named by their place in the key, so the 4 in C is F. The numbers guide in this path explains it, and the Studio can show any song in numbers.