AP Music Theory Unit 1 Review: Pitch, Major Scales and Key Signatures, Rhythm, Meter, and Expressive Elements

A pitch is a tone with a specific frequency. Its identity in notation depends on where the notehead sits on the staff and which clef is active. Treble clef places G on the second line; bass clef places F on the fourth line; alto clef (C clef) places middle C on the middle line; tenor clef places middle C on the second line from the top. Accidentals placed to the left of the notehead raise (sharp), lower (flat), or restore (natural) a pitch. Two pitches that sound identical but are spelled differently, such as C-sharp and D-flat, are enharmonic equivalents. On the aural sections of the AP exam, relative pitch is assessed, not absolute pitch.

Every note or rest symbol represents a specific duration. The hierarchy runs from whole note (longest) through half, quarter, eighth, sixteenth, and thirty-second. Each value is half the duration of the one above it. A single augmentation dot adds half the value of the note it follows; a double dot adds half again of that. A tie connects two noteheads of the same pitch and combines their durations without re-attacking the pitch. Beaming groups eighth and shorter notes to show beat placement clearly.

A half step (semitone) is the smallest interval in Western music, such as E to F or C to C-sharp. A whole step equals two half steps, such as C to D. The major scale arranges seven pitches using the pattern W-W-H-W-W-W-H. This pattern produces the same characteristic sound regardless of starting pitch. Each pitch in the scale has a scale degree number (1-7) and a name: tonic, supertonic, mediant, subdominant, dominant, submediant, and leading tone. The leading tone (scale degree 7) sits a half step below the tonic and has a strong tendency to resolve upward.

A key signature represents the sharps or flats of a major scale, placed at the start of every staff line after the clef. Sharps are added in the order F-C-G-D-A-E-B; flats in B-E-A-D-G-C-F. To find the major key from a sharp key signature, name the pitch one half step above the last sharp. To find the major key from a flat key signature, name the second-to-last flat. Pitches belonging to the key are diatonic; pitches outside it are chromatic. The circle of fifths arranges all major keys so that each step clockwise adds one sharp and each step counterclockwise adds one flat. Enharmonic key pairs (F-sharp major and G-flat major, C-sharp major and D-flat major) sound identical but are notated differently.

Meter organizes beats into measures at three interlocking levels: division, beat, and measure. If each beat divides into two equal parts, the meter is simple; if each beat divides into three equal parts, the meter is compound. The number of beats per measure determines whether the meter is duple (2), triple (3), or quadruple (4). A time signature encodes both relationships. In simple meters, the top number is 2, 3, or 4 and shows beats per measure; the bottom number shows the beat note value. In compound meters, the top number is 6, 9, or 12 and shows divisions per measure; the bottom number shows the division note value, so the beat is a dotted note. For example, 6/8 is compound duple: six eighth-note divisions, two dotted-quarter beats per measure.

Rhythmic patterns are the specific ways note values fill a beat. In simple meter, a beat can be filled with two equal divisions, four subdivisions, a dotted pattern (dotted eighth plus sixteenth), syncopation via a tie across the beat, or other combinations. Compound meter adds a three-division beat and its subdivisions. Beaming must show beat placement clearly: no beam may cross the half-bar in quadruple meter (no beam connecting beats 2 and 3 in 4/4). When notating from dictation, sequence values so the beat structure is visible. Swing rhythm is a style exception where the offbeat note occurs later than written, indicated by the word 'swing.' When sight-singing, sustain notes for their full duration, especially at cadential points.

Tempo describes the speed of the beat. Italian terms range from very slow (largo, grave) through slow (lento, adagio), moderately slow (andante, andantino), moderate (moderato), and fast (allegretto, allegro, vivace, presto, prestissimo). A metronome marking such as quarter note = 88 specifies exact beats per minute. Gradual tempo changes include accelerando (speeding up) and ritardando (slowing gradually); ritenuto indicates an abrupt slowdown; rubato allows flexible timing. Dynamics indicate relative loudness from pp (pianissimo) to ff (fortissimo), with mp and mf in between. Crescendo and decrescendo hairpins show gradual changes; subito indicates a sudden change; sforzando (sf or sfz) marks a sudden accent on a single note. Terraced dynamics contrast a loud passage immediately with a soft one. Articulation symbols include staccato dots (detached), tenuto lines (sustained), slurs (connected phrasing), and marcato accents (emphasized attack). In sight-singing, maintain steady tempo unless a change is notated, and apply the indicated dynamic and articulation markings.