It is possible for people to contribute vocal tracks, which can then be used in the “choir” for that song. To do this you must be capable of recording at good quality with no background noise. You play the MyMIDI backing track into headphones, and record just your voice. You then email your recordings to email@example.com. Singing quality needs to be decent. All vocal tracks get carefully edited so the choir is as clear and easy to follow as possible.