 The Andean charango, a small 5-course, 10-string guitar frequently made from an armadillo shell, is most usually tuned in re-entrant fashion, with re-entry between the third and second courses.Other members of the charango family, such as the hualaycho and charangon are usually similarly tuned; the ronroco is often, but not always tuned re-entrantly.The ten string classical guitar was originally designed for a specific re-entrant tuning invented by Narciso Yepes, now called the "Modern" tuning also.