Here you'll be shown the range of the viola. Demonstrated by Michael Turner of the Philharmonia Orchestra. Also commenting on composing techniques from the musicians point of view.
Lowest and highest notes on the viola. There are four strings on the viola which are tuned a Perfect 5th apart. The lowest is C then G, D and A is the top string. The lower strings have a richer, darker sound and to exploit this it is quite common for composers to write that a particular phrase should be played on a particular string. By writing Sul C (on the C) or Sul G above the music the player will continue playing on the low C or G string when they would otherwise have moved up onto one of the higher strings. The composer should know that one should not write Sul C more than one and a half octaves above the open string.