A scoring apparatus is constructed for evaluating a live vocal performance which is voiced by a singer along with a karaoke music synthetically reproduced from melody data. A first detector sequentially detects the live vocal performance to extract therefrom sample data which is characteristic of actual voicing of the singer. A second detector sequentially detects the melody data to extract therefrom time data representative of right progression of the karaoke music and reference data representative of right voicing which should match the karaoke music. A comparator sequentially compares the sample data and the reference data with each other to produce differential data which indicates difference between the actual voicing and the right voicing. A processor processes the differential data with reference to the time data to produce score data which represents degree of deviation of the live vocal performance voiced by the singer relative to the karaoke music.