This article is from the R.E.M. FAQ, by Ron Henry (rgh3@cornell.edu) with numerous contributions by others.
Stipe, like many other performers, wears an earpiece monitor when the band
performs live on stage. It is an earphone connected to the mixing board,
and allows him to hear himself singing, and is analogous to the small
angled loudspeakers you see on stage in front of the other musicians. In a
large amphitheater filled with very loud noise, one can well imagine how
easy it would be for the singer to get drowned out and not be able to hear
him or herself, and this earpiece monitor helps prevent that.
 
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