or BISDIAPASON, in music, a compound concord, described by F. Parran, in the quadruple ratio of $4 : 1$, or $8 : 2$.

Disdiapason Diapente, a concord in a sextuple ratio of $1 : 6$.

Disdiapason Semi-Diapente, a compound concord in the proportion of $10 : 3$.

Disdiapason Ditone, a compound consonance in the proportion of $10 : 2$.

Disdiapason Semi-Ditone, a compound concord in the proportion of $24 : 5$.