Major Chords
A major chord is the sound most listeners mean when they think "a chord" at all before they've studied any theory — bright, stable, resolved. The reason is entirely interval math: a major triad stacks a root, a major 3rd (4 semitones up), and a perfect 5th (7 semitones up). That major 3rd is the single interval responsible for the "happy," settled quality; swap it for a minor 3rd (3 semitones) and the exact same root and 5th produce a minor chord instead, which is why major and minor triads are so often taught as a pair — they share two of their three notes and differ by one semitone in the middle voice.
This hub combines two related qualities: the plain major triad and the major 6th chord, which adds a major 6th (9 semitones from the root) on top of the triad. That 6th is a genuinely different color from a major 7th — it's a whole step below the octave rather than a half step, so a 6th chord doesn't carry the same "wants to resolve upward" pull a major 7th chord does. Major 6th chords have a particular home in 1930s-40s swing and Great American Songbook-era jazz, where ending a tune on a 6th rather than a plain major triad became something of a genre signature — it reads as warm and settled without sounding plain.
Every major key's diatonic harmony is built outward from its major triad — the tonic (I) chord in any major key IS that key's major triad, and StrumAndKey's Diatonic Chords and Chord Function theory pages cover exactly how the other six chords in the key (ii, iii, IV, V, vi, vii°) relate back to it. On guitar, major chords divide cleanly into open-position shapes (C, G, D, A, E all have comfortable open forms) and the barre shapes that fill in the remaining seven keys — see Barre Chords Explained for why F, specifically, has no open-position major shape in standard tuning. On piano, a major triad's closed-position voicing fits easily under one hand in any key, which is part of why it's usually the very first chord shape a beginning piano student learns. On ukulele, major shapes are frequently one or two fingers thanks to the instrument's 4-string reentrant tuning and short scale length.
Across all three instruments and all 12 keys, this hub pulls together every major and major-6th chord page StrumAndKey has: 12 keys x 2 qualities x up to 3 instruments (ukulele includes the 6th; both major triads exist everywhere). Each page lists that root's actual notes, a fingering diagram or keyboard voicing where a genuinely playable shape exists, and prose specific to that exact chord — including which keys have comfortable open guitar shapes and which require a barre, since that's a real, checkable fact rather than a generic "easy chord" claim repeated across pages.
In a real progression, major chords rarely appear alone — the I-IV-V progression (three major chords built on a major key's 1st, 4th, and 5th degrees) is one of the most-used chord sequences across folk, blues, country, and early rock and roll, precisely because all three of those chords are major in a major key, giving a songwriter three bright, stable-sounding harmonic options without needing to reach outside the key's straightforward triads at all. The I-V-vi-IV progression (adding the relative-minor vi chord into that same rotation) is the four-chord sequence widely associated with a huge swath of 2000s-2010s pop precisely because it mixes exactly one minor chord into an otherwise all-major sequence — enough contrast to feel emotionally varied without leaving major-key territory.
Not every key's major chord is equally easy to reach on every instrument, and that unevenness is worth being upfront about rather than glossing over. On guitar specifically, C, G, D, A, and E major all have comfortable open-position shapes reachable within a beginner's first weeks; F, B, and the sharp/flat keys generally require either a barre or a more advanced fingering, a real and checkable difficulty gap StrumAndKey's individual guitar pages call out rather than claiming every major chord is equally beginner-friendly.
Enharmonic spelling is a genuine wrinkle worth naming plainly: C# major and Db major are the identical set of physical notes and the identical sound, just written two different ways depending on which key signature or context a piece of music is in. StrumAndKey's chord pages use sharp spelling throughout for consistency (matching the chromatic note list the site's theory engine computes from), but a musician reading from a chart written in flats should know they're looking at the same chord, not a different one — Key Signatures Explained covers the real convention that decides which spelling gets used where.
Major 6th chords deserve a closing note of their own here because they're easy to mistake for a first inversion minor 7th chord built a minor 3rd higher — C6 (C-E-G-A) and Am7 (A-C-E-G) share every single note, just with a different note treated as the bass/root. Which name is "correct" genuinely depends on context: if the bass note and surrounding harmony treat C as home, it's a C6; if A is home, the identical four notes are an Am7. This is a real, common source of confusion in lead sheets and chord charts, and it's the same relative-chord logic that connects major and minor triads more generally, just one layer more advanced.
A major chord's stability also makes it the natural resolution point for nearly every other chord family on this site — suspended chords resolve into it, dominant 7ths pull toward it, and even far more dissonant diminished and augmented chords are frequently used as passing chords specifically because they lead the ear back to a plain major triad's settled sound. Understanding the major chord family well is, in a real sense, understanding what every other chord on StrumAndKey is either building away from or resolving back toward.
Beginners on every one of StrumAndKey's three instruments overwhelmingly encounter major chords first, and for good reason: a major triad's three notes are the shortest, simplest path to a stable, immediately recognizable, pleasant-sounding chord on any instrument, with no ambiguity about quality and (on guitar and ukulele specifically) frequently the easiest fingerings available in a given key. Method books across all three instruments consistently sequence major chords before minor, and minor before the more advanced qualities covered in this site's other hubs, which is a genuine pedagogical pattern reflected in how StrumAndKey's own roster is organized, not an arbitrary hub-naming choice.
A major chord played in different octaves or registers — low and bassy versus bright and high — retains its exact harmonic identity throughout, since transposing a chord by a full octave doesn't change any of its interval relationships, only its absolute pitch range. This is worth stating because StrumAndKey's diagrams necessarily show one representative octave/position per chord, but the underlying major-chord theory documented on every page in this hub applies identically regardless of which octave a player ultimately voices it in.
Ear recognition of a plain major chord is often the very first "I can hear that" moment a new musician experiences, well before they can name intervals or read notation — that instinctive recognition is genuinely worth trusting and building on, since the theory covered across this hub (and linked out to How Chords Are Built and Diatonic Chords) exists to explain what the ear already knows, not to replace or override it.
Recording engineers and producers frequently describe major chords as sitting comfortably in a mix with minimal EQ or arrangement work, precisely because a major triad's intervals (major 3rd, perfect 5th) are close to naturally consonant with each other under equal temperament — a real, practical reason major-chord-heavy sections of a song often need less production intervention than passages built on more harmonically complex or dissonant chords documented elsewhere on this site.
Children's music, folk singalongs, and a great deal of worship and hymn writing lean overwhelmingly on major-chord harmony specifically because of that immediate, unambiguous brightness — a genuine, describable stylistic pattern rather than a coincidence, and part of why this hub's pages see disproportionately heavy traffic from beginners of every age looking for the first handful of chords that will let them play recognizable, singable songs right away. That immediacy is a real, practical reason major chords remain the correct starting point for nearly every new player on every instrument this site covers, and it's why this hub is deliberately positioned as the natural first stop for anyone new to StrumAndKey's chord roster as a whole, ahead of every more advanced family documented elsewhere on the site — start here if unsure where to start at all on any instrument, since nothing later in this site's chord vocabulary makes full sense without this foundation in place first.
Related reading: How Chords Are Built explains the stacked-3rds construction behind every triad from first principles, and Minor Chords is the natural next stop for hearing exactly what changes when that one middle note drops a semitone.