QUOTE(freda_bloogs @ Feb 26 2008, 09:53 PM)

What John says is true, generally yes, but in older music (mainly) you will get what's called measured tremolo. I imagine what you'll have is a stem with 3 lines through it? If so, as fast as possible yes! However, you might see in Haydn, for example, a crotchet with one line through it: play 2 quavers, then 2 lines would mean play the crotchet as 4 semiquavers. I think this is more common in orchestral scores in order to save space.
Hi, I have the Dover edition (Schenker) and the Belwin Publishing edition (Krebs). I'm referring to ms. 13 (Allegro molto e con brio section) on, and there are 2 sets of 2 half notes each measure in the LH. They are joined by a thick single line. There is noting in either edition to define the tremolo. That would indicate 2 quavers or 4? Thx.