Early versions of the timpani appeared in pairs, and since they were cumbersome to tune, the tuning was set before the performance on fixed pitches which matched the [[key (music)|key]] of the work being performed. Most usually this equated to the tonic and dominant degrees of the [[scale]]. Modern timpani on the other hand, can be tuned very easily using a foot pedal, and usually exist in the modern orchestra as a set of five. | Early versions of the timpani appeared in pairs, and since they were cumbersome to tune, the tuning was set before the performance on fixed pitches which matched the [[key (music)|key]] of the work being performed. Most usually this equated to the tonic and dominant degrees of the [[scale]]. Modern timpani on the other hand, can be tuned very easily using a foot pedal, and usually exist in the modern orchestra as a set of five. |