The viol has become increasingly popular in recent years as an instrument for the amateur with an interest in early music. With this rise in popularity has grown the need for a tutor that gives detailed advice on playing technique with an awareness of the specific requirements of the adult beginner. Play the Viol is the first comprehensive modern guide written to meet exactly this need. It includes technical instruction based on original sources together with Alison Crum's extensive teaching and performing experience. The book assumes no knowledge beyond an ability to read music; its aim is to help the player reach an advanced level, even without regular access to a teacher. Points are illustrated with photographs, diagrams, and carefully graded musical exercises. The book surveys the viol's repertoire with a wide-ranging list of published music, offers solutions to problems likely to be encountered, and includes practical information on choice and care of viols and bows.
This single volume contains as much useful, concise, and accurate information on playing the viol as you're likely to find in any overview of the instrument.
There are certain specifics of its advice on technique that I (and expert players who have taught me) disagree with but in the main, it is my go-to source. It touches upon not strictly technical concerns but also the history of the instrument, selecting a model of viol for specific purposes, looking after it, and tuning it in various temperaments. It also contains an introduction to the repertoire available for various models and combinations of viols.
The only barrier to many potential purchasers might be the cost of a new copy since it carries a price tag similar to academic textbooks. Regardless, it's well worth hunting it down if you plan to make an earnest go of picking up viol.