How do I get trills between two different notes?
In the 1st Movement of Beethoven's Pathetique Sonata, there is a theme known as the "Rocket" Theme, which ascends incredibly quickly, but then descends slightly slower. In the left hand of this descent, there are two notes an octave apart, but they are being alternated really quickly.
The notation for this (or at least in my version, which is the Pearson Edexcel Music GCSE Anthology) looks like quaver stems but with a minim note head. I was wondering what these were called and how I could put them into my own composition? Thanks