What clefs must a string player be able to read?
That depends on what instrument you play. Violins only have to deal with treble. An intermediate cello player should be able to read and play both bass and tenor clef, and being able to read treble cleff is highly desirable. An advanced cello player should be able to read and play from the bass, tenor, treble, and transposed treble clef (reading the treble clef and playing an octave down). A viola player should be able to read and play from both the alto and treble clefs.
