Notes, octaves and the keyboard

Every range in this book is written in scientific pitch notation: a letter, maybe a sharp or flat, and a number. The system takes five minutes to learn and then never leaves you, and without it the atlas is a wall of code. Here is the whole thing.

The letter and the number

The letter names the note inside an octave — the white keys run C, D, E, F, G, A, B, and then the pattern repeats. The number tells you which octave, and octaves change at C, not at A. So the count runs A3, B3, C4, D4 — the number ticks up as you cross C.

C4 is middle C, the C nearest the middle of a piano. Everything else hangs off that anchor. A4 is the A above middle C, the orchestra's tuning note at 440 Hz. C5 is an octave above middle C; C3 an octave below. The lowest note on a standard piano is A0, the highest C8. Almost every singing voice on earth lives somewhere between C2 and C6; the atlas's outliers stretch past both ends, which is what makes them outliers.

For quick intuition: most men speak somewhere around C3, most women around G3–A3. Find your speaking pitch on a keyboard once and the whole notation system snaps into focus, because every figure in this book becomes "so far above where I talk, so far below."

Sharps, flats and the same-note problem

The black keys carry two names each. The key between F and G is F# — F raised a semitone — and also Gb, G lowered one. F#5 and Gb5 are the same pitch, and which spelling you see is convention and habit, nothing more. The atlas mostly picks one spelling per entry and sticks with it, but when you cross-reference other sources you will meet the twin. Do not read Eb6 versus D#6 as a disagreement; it is one note wearing two name tags.

A semitone is the distance between any key and its immediate neighbor, black keys included — the smallest step Western music uses. Twelve of them make an octave. Those two facts are the entire arithmetic of this book.

Counting a span

A range like C3–C5 spans two octaves: count the Cs. When the ends do not line up so neatly, count semitones and divide. B2 to E5 is 29 semitones; 29 ÷ 12 is 2.4 octaves, and the entry will say so. The singer pages do this math for you, showing both the semitone count and the decimal.

Two warnings about spans, because they are the most misread numbers in the atlas. First, a span says nothing about what fills it. A 2.1-octave voice that is strong everywhere is a better instrument than a 4-octave figure held together by two party tricks — the full-voice ceiling from the last chapter tells you which you are looking at. Second, octaves are not linearly impressive. Almost every healthy adult can be trained to two octaves; three connected octaves is genuinely uncommon; four is a handful of people per generation. The difference between 2.0 and 2.5 is practice. The difference between 3.5 and 4.5 is mostly genetics and mechanism-switching, which is why the method chapters keep pointing you at the middle of your voice instead of the ends of someone else's.

Why sources disagree

Look up any singer in this book elsewhere and you will find a different figure — sometimes wildly different. The variance has boring causes, and knowing them inoculates you against range-war arguments online.

Different evidence pools: one transcriber counts studio recordings only, another counts every live bootleg, a third counts a warm-up clip posted on social media. Different rules: some count vocal fry rumbling below the chest voice, some count a squealed glissando as the top, some insist a note must be sustained and musical to count at all. Different ears: transcription at the extremes is hard, and a note at the edge of hearing on a distorted live tape gets called D8 by one listener and C#8 by the next. Stack three lenient rules and a singer gains an octave without singing a note.

The atlas's rules, for the record: fry lows count only where they are a documented, deliberate part of the singer's recorded work; glissando peaks count as the cited top only when they are the figure that genuinely circulates; whistle is flagged as whistle; and between two defensible figures, the entry takes the smaller. When your favorite singer looks shortchanged here by a semitone, that is why.

What to do with all this

Learn to hear the notation, not just read it. The singer pages will play any cited range out loud on a keyboard — use that until F#5 is a sound in your head and not a string. Then take your own range test, write your own two numbers in the same notation, and the atlas stops being trivia. Every figure in the next several hundred entries becomes a measurement on the same ruler you have been measured with, which is the only way a compendium like this becomes useful rather than merely long.