 The Handbook was influential because it put forth an accessible version of Pythagorean harmonics (Barker 2014, 200–202). Nicomachus provided a more detailed treatment of Pythagorean harmonics in his lost Introduction to Music. Most scholars agree that Books I-III and perhaps Book IV of Boethius’ De Institutione Musica are a close paraphrase, which is often essentially a translation, of Nicomachus’ lost work (see Bower in Boethius 1989, xxviii and Barker 2007, 445). Even more influential than his work on harmonics was Nicomachus’ Introduction to Arithmetic. Again Nicomachus was not an original or particularly talented mathematician, but this popularizing textbook was widely influential. There were a series of commentaries on it by Iamblichus (3rd CE), Asclepius of Tralles (6th CE), and Philoponus (6th CE) and it was translated into Latin already in the second half of the second century by Apuleius. Most importantly, Boethius (5th-6th CE) provides what is virtually a translation of it in his De Institutione Arithmetica, which became the standard work on arithmetic in the middle ages. On Boethius’ use of Nicomachus see Hicks 2014, 422–424.