(Music Sales America). Otakar Sevcik's Violin Studies Op. 9 is a comprehensive collection of preparatory exercises in double stopping on the violin. 58 exercises have been assembled to give you the best and most versatile approach to playing chords, harmonies and pedals in your violin playing. The book includes extensive guidance and performance tes in Italian, French, German and English. An excellent source of technical challenges that will expand your musical vocabulary and focus your skills.