Practice multi-part songs alone. Control the volume of each part separately, so you can:

* Listen to the song with all the parts

* Listen to just one or two or three parts

* Listen with several parts turned down low, so that the part you’re trying to learn comes through more clearly

* Sing along with the volume turned up on the part you’re trying to learn, making it easier for you to keep on track

* Sing along with the volume turned down on your part, challenging yourself to stay on track even with other parts dominating

* Sing along with the volume turned off on your part — the ultimate challenge

For more information, see:
http://choirapps.org/ubuntu-choir-practice-companion/