Music Theory Fundamentals Cheat Sheet

A printable reference covering notes, clefs, rhythm, time signatures, scales, intervals, chords, and key signatures for grades 6-9.

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Music theory fundamentals explain how written music shows pitch, rhythm, structure, and harmony. Students need this cheat sheet to read notation more confidently and connect symbols on the page to sounds they hear or perform. It is useful for band, choir, orchestra, piano, guitar, composition, and general music classes. The goal is to make the most common rules easy to find during practice and review. The core ideas include naming notes on the staff, counting beats, reading time signatures, and building scales and chords. A major scale follows the pattern W W H W W W H, where W means whole step and H means half step. Basic triads are built from the 1st, 3rd, and 5th notes of a scale. Intervals, key signatures, and rhythm values help musicians understand how melodies and harmonies are organized.

Key Facts

The treble clef line notes from bottom to top are E, G, B, D, F, and the space notes are F, A, C, E.
The bass clef line notes from bottom to top are G, B, D, F, A, and the space notes are A, C, E, G.
In 4/4 time, a whole note gets 4 beats, a half note gets 2 beats, a quarter note gets 1 beat, and an eighth note gets 1/2 beat.
The top number of a time signature tells how many beats are in each measure, and the bottom number tells which note value gets one beat.
A major scale uses the step pattern W W H W W W H, such as C, D, E, F, G, A, B, C for C major.
A natural minor scale uses the step pattern W H W W H W W, such as A, B, C, D, E, F, G, A for A minor.
A major triad is built with scale degrees 1, 3, and 5, while a minor triad has a lowered 3rd compared with the major triad.
Sharps raise a pitch by one half step, flats lower a pitch by one half step, and naturals cancel a previous sharp or flat.

Vocabulary

Staff: A staff is the set of five lines and four spaces where notes are written to show pitch.
Clef: A clef is a symbol at the start of the staff that tells which pitches the lines and spaces represent.
Measure: A measure is a small section of music separated by bar lines and containing the number of beats shown by the time signature.
Interval: An interval is the distance in pitch between two notes.
Scale: A scale is an ordered pattern of notes built from whole steps and half steps.
Triad: A triad is a three-note chord usually built from the 1st, 3rd, and 5th notes of a scale.

Common Mistakes to Avoid

Confusing the treble clef and bass clef note names is wrong because the same line or space represents different pitches depending on the clef.
Counting the top and bottom numbers of a time signature the same way is wrong because the top number gives beats per measure, while the bottom number gives the beat unit.
Forgetting that a dot adds half the note value is wrong because a dotted half note equals 3 beats in 4/4, not 2 beats.
Building a major scale with equal spacing is wrong because a major scale must follow W W H W W W H.
Calling every three-note group a triad is wrong because a true basic triad is usually stacked in thirds, such as root, 3rd, and 5th.

Practice Questions

1 In 4/4 time, how many beats are in a measure that contains one half note, one quarter note, and two eighth notes?
2 Using the major scale pattern W W H W W W H, write the notes of the G major scale.
3 Build a C major triad by naming scale degrees 1, 3, and 5 from the C major scale.
4 Explain why the time signature 3/4 does not mean the same thing as 4/4, even though both use quarter notes as the beat unit.