Abstract: A method for determining a fundamental frequency of a note in a musical signal comprising the steps of receiving the musical signal; determining a frequency of each of a plurality of tracks of the musical signal; generating a plurality of subharmonics for each track; and computing the fundamental frequency based on a frequency of at least one subharmonic selected from the plurality of subharmonics, the frequency of the at least one selected subharmonic being within a neighborhood of the frequency of the track having a lowest frequency.

Abstract: A system for making a lesson authored by a teacher accessible to a class of one or more students and for making homework authored by a student belonging to the class accessible to the teacher. The system includes a first client, a second client, and a server computer, all of which are connected to a computer network. The server computer maintains a database including information about the teacher, the student, the class and the lesson. The server computer provides a script to the first client computer and to the second client computer for executing a notation computer program. The notation computer program is utilized to author the lesson or the homework. The lesson or the homework is transferred from the first or the second client computer to the server computer for making the lesson or the homework accessible to the students of the class or the teacher.