Early Music Companion supports those who perform Medieval and Renaissance (early) music, as well as those who teach this music to others. Currently Early Music Companion is implemented as an iPhone or iPad app available in the Apple AppStore (an Android version is in development).

Early music was composed on the basis of music theory that is no longer in use. As with modern compositions, early music scores do not provide every detail needed to perform them properly. Musicians are expected to learn how to interpret scores, based on the music theory employed when they were written. Early Music Companion provides a variety of resources to help performers interpret Medieval and Renaissance music.

The Early Music Companion project goal was simply to capture in an app the kinds of information that might be convenient for performers and students of Medieval and Renaissance music. New information is added as it becomes available in frequent updates.