ok so its like musical notes you know c, a ,b....and so on, i have no clue about that sort of thing but what i have found is
this this shows the notes to frequencies so: if i wanted a b note i would use:
/usr/bin/beep -e /dev/input/event0 -f 123.47 -l 300
the -f tells it the frequency (i.e the note) and the -l is the lenght of the note (so -l 300 is blaah or -l 600 is blaaaaaaaah)