Sight-singing means performing written music vocally on the first attempt, translating notation into sound without prior rehearsal or an instrument to lead you. It is a cornerstone of ear training and general musicianship because it forces you to hear pitches in your mind before you produce them. Many teaching traditions use solfege, assigning syllables such as do, re, mi, fa, sol, la and ti to scale degrees so that relationships between notes become second nature. Practicing sight-singing sharpens interval recognition, rhythmic reading and intonation all at once, and it strengthens the inner hearing that lets musicians imagine music silently. Progress comes from regular, graded practice: starting with stepwise melodies in familiar keys and adding leaps, accidentals and new keys over time. Immediate feedback on whether each note is in tune accelerates learning, which software can provide by listening as you sing. FretMind's SingOnSight displays notes for you to sing and validates each pitch through your microphone in real time, adapting to your voice range.