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, find a loop by Instrument, Genre, or Descriptor, and then drag it into an empty part of the Tracks area. You can customize Loops to fit your song, using a simple set of controls.
Record your voice. Connect a microphone, choose Track > New Track, then select the microphone under Audio. Set options for input, output, and monitoring, then click Create. Click the Record button 
Learn more. See the GarageBand Support.
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