With this App you can sing Barbershop tags, short harmonic pieces of music. For that you can use the sample files included in this App to listen to all four voices, the tenor, the baritone, the bass and the melody part, the lead. If you want to sing i.e. the bass part, just tap on the bass guy - the second from the left - to mute this part of the song and sing it by your own.
If you want to listen to bass, just switch the rest off and the bass on. That´s it. Easy, isn´t it?
If you want to select a different song, just tap on the button on the top of the display and select the one you want.