The flam is a distinct sound created by two successive drum strikes made by the
two sticks. It is essentially a way to embellish any given note
and play it in a "fancier" fashion.
The flam consists of a main note, made by the
second stick that hits the drum, and a preceding grace note that's played right before it.
The main and grace notes must be played a small fraction of a second apart,
or they will sound like two separate notes. They must also not be played too
close together or both sticks will essentially strike the drum at the same time
resulting in an ugly, choked sound.
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