When violinists tackle running sixteenth notes with some string crossings, sometimes they are frustrated because they can’t get comfortable and secure even after practicing the music for a while. For instance in La Folia you might have difficulty with the sixteenth note variation. Of course you have to spend a little time planning your fingerings and finger patterns, and make sure you understand the string crossings. After you've gotten those things a little organized though, it is efficient and more fun to practice the music with a friend or your teacher playing the bass line, so you’ll practice in a way that makes musical and rhythmic sense and makes the “hard notes” enjoyable to play. Download this arrangement for two violins and give it a try!