USIC was written in a scrawl impossible to decipher up to the thirteenth century, when Plain Song (Plain Chant) made its appearance in square and diamond-shaped notes. The graduals and introits had not yet been reduced to bars, but the songs of the troubadours appear to have been in bars of three beats with the accent on the feeble note of each bar. However, the theory that this bar of three beats or triple time was used exclusively is probably... more...