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You can solo a track, silencing all tracks that are not also soloed. Soloing tracks is useful when you want to work on a track individually, or work on a few tracks, without hearing the other tracks in the project.
In GarageBand on Mac, click the track’s Solo button 
in the track header.
The Solo button turns yellow, and the Mute buttons of all unsoloed tracks flash blue. Click the button a second time to restore the track to its previous state.
In GarageBand on Mac, do one of the following:
Click and hold a Solo button in a track header, then drag the pointer up or down.
The Solo buttons of all swiped tracks switch to the same state.
Hold down Shift while the Solo button in the control bar is active, then click the names of the tracks you want to solo.
You can make tracks solo safe. When you solo another track, the solo safe track no longer mutes.
In GarageBand on Mac, Control-click the Solo button in a track header.
Control-click the Solo button again to deactivate the track’s solo safe state.