Training
Choir Part Practice
Pick your voice part and sing it with the score in front of you, while the other three parts play softly underneath. Not sure of your part? Try the Voice Range Finder in the Singers course.
Choir Part Practice · Amazing Grace (simplified)
Your part (Soprano) — treble clef. Lyrics under each note.
Sing your part along with the playback. Turn the other parts down (or tick "My part only") until you're confident, then bring them back up.