 "Ti" is used in tonic sol-fa (and in the famed American show tune "Do-Re-Mi").An alternative theory argues that the solfège syllables ("do, re, mi, fa, sol, la, ti") derive from the syllables of an Arabic solmization system درر مفصّلات "Durar Mufaṣṣalāt" ("Detailed Pearls") ("dāl, rā', mīm, fā', ṣād, lām, tā"'), mentioned in the works of Francisci a Mesgnien Meninski in 1680 and later discussed by Jean-Benjamin de La Borde in 1780.However, there is no documentary evidence for this theory.