Fernando Sor's 24 studies Opus 35
is an epic collection to learn.
Here is a duet arrangement from the book.
This is the long, slow, `Largo' speed to practise along to.
Follow the finger numbers (eg. 4=little finger)
carefully at this speed, then when you perform it full speed
you will have the techniques practised:
Hold each of the lower notes as long as possible
eg. as shown with the echoing big string in the second bar.