How can I mute the built in mic.

Can't find an answer to this in the forum so here goes.
How can I mute the build in mic? Playing music through quicktime or iTunes on a MacBook Pro and I'm picking up sound through the mic which is irritating to say the least.
(Why on earth we couldn't have two audio ports on this machine is beyond me......)

Go to System Preferences on that click sound icon select input chose which mic you want

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