There are lots of really good singers out there who don't sight read music as well as they would like to.
Most of the folks in the choirs I've ever been in were in that category. Heck, I am in that category. For us it can be a bit time-consuming and difficult to learn harmony parts.
One way of making the job much easier and faster is to be able to listen to your part all by itself. While there are obviously many ways to get audio recordings of all the parts of a song individually, one of the quickest and most versatile methods is to get a MIDI file of the song.
If you need a reminder of what MIDI is, see our post MIDI Recording – What Is It And Why Is It Awesome? and our video Intro To MIDI and
MIDI files are especially awesome when your group is learning a classical, medieval/renaissance, or some other public domain piece.
First, many of these songs are already freely available on the internet.
Second, those files typically contain all the harmony parts so that all you need to do is import the file into an audio program on your computer and you can listen to any or all of the harmony parts together or separately.
If the song in question is not public domain (be careful of copyright issues), you can use a notation program to enter the parts. In fact, if you have a notation program (examples are: Sibelius First ($104.99), Finale PrintMusic ($89.99), Notation Composer ($98.99), Noteworthy Composer ($49) and Musescore (Free)), you can enter all the parts and tghen export the file as a MIDI file to share with other members of your group.
MIDI files are pretty universal and can be read by most audio programs. I use Reaper to do this, but it works in lots of programs, including Garage Band (for the Mac users).
You can practice in the car, or anywhere else you can listen to your portable music player or phone. Do this by rendering an audio file (or several of them) from Reaper (etc.). Then you can put the MP3 onto your your phone or mp3 player to practice while out and about.
The video below shows you how to do all of this. I hope it helps those of you who may be having a bit of trouble nailing that harmony part.