I'm trying to teach myself some Schubert and am playing through Sonate 1 (Op. 42). The piece employs a lot of trills. However, there are two notations in use: tr and the up & down squiggle. Is ...
There are two symbols I do not recognise below the stretto in this excerpt: What are these symbols? And also, form what I read the stretto here should be interpreted as an accelerando, am I ...