Definition of bourdon:
"1985: The earth tremors resumed and made a bourdon to the loud psalms that they sang, interspersed with the odd ode of Horace recited by Silas. -- Anthony Burgess, Kingdom of the Wicked"
Definition of bourdon:
"1985: The earth tremors resumed and made a bourdon to the loud psalms that they sang, interspersed with the odd ode of Horace recited by Silas. -- Anthony Burgess, Kingdom of the Wicked"