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In Sacred Harp, before a song is sung, somebody sings out the notes of the opening chord of the song using a combination of ear/feel/memory/practice/experience. The same song can be keyed a bit higher or lower depending on things like: energy of the singers, time of day, whether the last song was quite high or low, how easy the highest or lowest written notes are for the singers in the room. It is a skill! But most keyers will usually pitch songs written in F major at roughly the same pitch and will pitch songs written in D major differently to F major.

From the FaSoLaMix site [1]:

> "FaSoLaMix" is an iOS app designed to teach Sacred Harp singing to newer singers. When someone wants to learn to sing, our instinct is usually to recommend that the inquirer go to a good singing and sit next to a strong singer. But not everyone lives near many all-day singings. Our intent is to give the listener the virtual experience of sitting next to a couple of strong singers in whichever section suits their voice. The app features high-quality recordings of many Sacred Harp songs where the mix of the four parts can be controlled manually. For example, a singer wanting to learn the treble line of a particular song could leave the treble track at full volume, mute the other three parts, and sing along with the solo treble part for practice. While the most obvious benefit will be to new singers, longtime singers will also find it useful and fun. For example, experienced singers may wish to mute one part and fill in that missing part with their own voice.

Couple of links to get going…