Originally Posted by: iamthe_eggmanOK, I think it's getting a bit confused here.

AFAIK (in the guitar universe; not necessarily music-wide):

Tremolo = rapid picking of a note
Vibrato = the quick raising and lowering of the pitch of a note...

[font=trebuchet ms]Close.

Vibrato is what happens to the note when the finger that determines the note (not just fretting, but on fretless instruments like violin or cello) is rolled back and forth. This is mostly pitch variation.

Tremolo (tremolando) is variation in the volume intensity of the sound. This effect is quite common on amps, but true vibrato is almost entirely limited to newer gear with digital processing.[/font]