ACEGBDF

ACEGBDF is a sequence of musical pitch names that represents a specific ordering of the seven natural notes. The sequence is formed by arranging the notes as A-C-E-G-B-D-F. There is no widely established theory tied to this exact ordering; it is primarily a permutation of the diatonic pitch classes used for instructional or analytic purposes.

The first four notes, A-C-E-G, spell an A minor seventh arpeggio (A-C-E-G). The last three notes, B-D-F, form a B diminished triad (B-D-F). Taken together, ACEGBDF contains all seven natural notes (A through G) within one octave and is diatonic to the keys of C major and A minor.

In terms of intervals, the sequence alternates between minor and major thirds: A to C is a minor third, C to E a major third, E to G a minor third, G to B a major third, and B to D and D to F are both minor thirds. This pattern can be used to illustrate chord tones, arpeggiation, and voice-leading concepts in pedagogy or analysis.

ACEGBDF is not a standard musical term or widely cited concept; rather, it serves as a particular ordering of the diatonic notes that may be employed in exercises, demonstrations, or puzzle contexts to explore relationships among scale degrees, arpeggios, and triads.