Xitona Singing Tutor shows your rate during singing, also it visually shows your voice-line and song melody notes so you can immediately correct your voice. Singing Tutor idea is simple. Each note features a defined pitch frequency. The higher note has the higher frequency and vise versa. Singing Tutor allows to measure the pitch frequency of the voice or music, with high precision, and to compare it with pitch frequency of the reference note.