Concepts

The most common blues form: a 12-measure chord pattern built on the I, IV, and V chords that repeats for each verse. It's the harmonic loop under thousands of blues, R&B, and rock songs.

An interval of three half-steps spelled as a second — like F up to G♯. Wider than any step a major scale allows, it gives the scales that contain it (harmonic minor, freygish) their dramatic, 'Eastern' colour.

A hard accent on beats 2 and 4 — usually a snare-drum crack — over a steady pulse. It's the engine of rock, R&B, and pop, and what rock traded the blues shuffle for.

Pitches sung or bent slightly lower than the major scale expects — most often around the third, fifth, and seventh. They're the 'aching' notes that give blues and jazz their color.

A chord progression that closes a musical phrase — harmony's punctuation. Some cadences sound final, coming to rest on the home chord; others leave you hanging, wanting more.

A back-and-forth pattern: one voice (the 'call') is answered by another voice or instrument (the 'response'). It's a core organizing principle from West African music through work songs, spirituals, and the blues.

Moving by half-steps through notes outside the current scale. Chromatic notes step between a key's tones, adding colour and tension without belonging to the home scale.

A free-time improvised lament of Romanian origin, adopted by klezmer as its great solo showpiece: the band holds a drone, the beat stops, and a violin or clarinet pours out ornamented phrases like a voice in prayer.

The fifth degree of a key — and the chord built on it. Its pull back toward the home chord (the tonic) is the strongest movement in tonal harmony; a dominant seventh sharpens that pull.

A flat (♭) lowers a note by one half step — one key to the left; a sharp (♯) raises it one key to the right. The same black key can carry either name: E♭ and D♯ are one key.

The signature klezmer mode — Yiddish for 'Phrygian': a scale with a flattened second but a major third, leaving a dramatic augmented-second leap between them. Hebrew prayer calls it Ahava Rabbah; Western theory, Phrygian dominant.

The three primary chords of a key — built on its first, fourth, and fifth notes. Almost every blues, folk tune, and early rock song lives inside these three chords.

The distance between two pitches, named by how many letter-names it spans and its quality — a major third, a perfect fifth. Intervals are the raw material of both melodies and chords.

Yiddish for 'sob' or 'groan' — the little cracking catch a klezmer clarinet or violin puts on the tail of a note, imitating a voice breaking. It's much of why klezmer seems to weep and laugh at once.

A scale made by treating a different note of a parent scale as home. Play only the white keys but centre everything on D and you get Dorian — same notes, new tonic, new mood.

A five-note scale. With no half-steps between its notes, nothing clashes — which is why it's the safe backbone of blues, rock, and folk melodies.

The US record industry’s name, from the early 1920s into the 1940s, for 78s by Black musicians sold as a separate catalog to African American buyers — a Jim Crow marketing category, not a genre. Mamie Smith’s “Crazy Blues” (1920) is what convinced the labels the market was real.

The note a scale or chord is built from and named after — the one that feels like 'home.' In A blues, A is the root; every other note is measured from it.

A small set of notes — usually five to seven — chosen from the twelve on the piano and treated as 'home' for a piece of music. Play only those notes and everything sounds like it belongs.

The notes of a scale numbered from the root: 1 is home, 2 is the next letter up, and so on to 7. A ♭ in front (♭3, ♭5) means that note is one half step lower than plain.

A swung feel where each beat is split into a long-then-short pair (like a triplet with its middle note dropped), giving blues and swing their loping, rolling groove.

The two smallest distances between notes. A half step is the jump to the very next key — piano or fret; a whole step is two of those, skipping the key in between. Scales are just patterns of these.

Accenting the weak parts of a beat — the 'off-beats' — so the rhythm pushes against the steady pulse instead of sitting squarely on it. It's what makes music feel like it's leaning forward.

A three-note chord built by stacking two thirds — a root, a third, and a fifth. Major and minor triads are the basic building blocks of harmony.

The interval three whole-steps wide — exactly half an octave, and the most restless sound in Western harmony. It's the ♭5 'blue note' and the tension inside every dominant seventh chord.