Similarly, other musical intervals—i.e., ratios between frequencies—have names that are all arguably off by one. A “perfect fifth” is, e.g., from C to G. C,D,E,F,G: five notes. So a fifth plus a fifth is (not a tenth but) a ninth.
Similarly, other musical intervals—i.e., ratios between frequencies—have names that are all arguably off by one. A “perfect fifth” is, e.g., from C to G. C,D,E,F,G: five notes. So a fifth plus a fifth is (not a tenth but) a ninth.