Mind's ear.
The portion of the ear located within the temporal bone which includes the semicircular canals, vestibule, and cochlea and is responsible for hearing and balance.
The act of rehearsing or contriving something; the fact of something's being rehearsed.
A preparatory activity analogous to the rehearsal of a show.
The practicing of something which is to be performed before an audience, usually to test or improve the interaction between several participating people, or to allow technical adjustments with respect to staging to be done.