As mentioned, a garage band is a
band, usually made up of a small
group of
friends of around
high school age, that play in one of their garages for their
enjoyment and to the
dismay of the
neighbors.
While a few of these bands eventually go on to great things, most are never heard of beyond their city, perhaps releasing an album and doing the rounds of the local clubs and other live band venues. Some never become good enough to even make it out of the garages.
One notable garage band from the silver screen would be Wyld Stallyns. For those of you who don't watch many movies or who are under 20 *sigh* the movie in question would be Bill and Ted's Excellent Adventure.