Tetrachords

• “Four note” scales
• Ancient Greece – any combination of M2 and m2 that creates a P4
• Contemporary – any 4-note scale

Major Tetrachord “Stairs”

Key Signatures

• Use to determine the tonal center (scale, key)
• Accidentals apply to ALL octaves
• Key signatures always appear in the following order:

Order of Sharps – F C G D A E B

Order of Flats – B E A D G C F