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 $16:3$.

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

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