<Tr> <Td> 5 </Td> <Td> Pentad </Td> <Td> Pentachord </Td> </Tr> <Tr> <Td> 6 </Td> <Td> Hexad </Td> <Td> Hexachord </Td> </Tr> <Tr> <Td> 7 </Td> <Td> Heptad </Td> <Td> Heptachord </Td> </Tr> <Tr> <Td> 8 </Td> <Td> Octad </Td> <Td> Octachord </Td> </Tr>

The system of scales and keys that includes chords of rest and chords of movement is called tonality