An audio teaching system for use in choral instruction is illustrated having a four-track cassette recorder/player interconnected with a four- channel amplifier leading to a set of earphone amplifier control boxes, each having a single earphone attached thereto.P PThe system provides for said cassette player to be used in conjunction with specially prepared tapes having the four harmonic parts of the music selection recorded on separate channels.PP Each of said control boxes has its own volume control, amplifier, single earphone, and also contains a selector switch which allows the choir member to choose to monitor one or all of the harmonic parts.
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