single note

[sparkie-48]

what is a single note in music called

[dizzybim]

Could be:
a, b,c,d,e,f,g
or doh, ray, me so fa,la,te,doh
or
crotchet (quarter note) - 1 beat so usually discribed as a single note...

minim (half note)

quaver (eighth note)

The repetition of a single note, as fast as possible, is called tremolo

[squarebear]

Sparkir, you have already asked this:
http://www.theanswerbank.co.uk/Music/Question7 78195.html

You need to tell people how many letters are in the clue and if you have any filled in, as you can see that many answers will fit.

The clue is 5 letters long and is M-N-D
Not Minim, as he is sure the D is correct.