Much as I enjoy a lot of Mendelssohn’s music, I will admit that it rarely plumbs great emotional depths (which isn’t a bad thing). However, one exception is the powerful slow movement of his String Quintet no. 2, which has a grave, almost Bachian stateliness with its “walking bass” cello line. It rises to a climax of great emotional intensity not often found in Mendelssohn’s output.