# All about 5ths

Rules for 5ths:
1. The intervals that are white notes use only white piano keys. Those that are black notes use at least one black piano key.
2. 5ths use five letters. (For example, C—G is C D E F G.) Their “size” depends on how many keys we skip.
3. A diminished 5th skips five keys. It is three whole steps. A diminished 5th is frequently called a ”tritone”. An augemented 4th also skips five keys, also is three whole steps, and also is called a “tritone”.
4. A Perfect 5th skips six keys. It is three whole steps + a half step.
5. An augmented 5th skips seven keys. It is four whole steps .
6. A diminished 5th is frequently called a ”tritone”. An augemented 4th also skips five keys, also is three whole steps, and also is called a “tritone”.

Note to more advanced students:
1. Circle one shows a C dim triad. It also shows that two minor thirds = a diminished 5th or tritone.
2. Circle two shows that both Major and minor triads use a Perfect 5th.
3. Circle three shows C aug triad. It also shows that two Major thirds = an augmented 5th.