== External links ==*Converter: Frequencies to note name, +/- cents*Note names, keyboard positions, frequencies and MIDI numbers*Music notation systems − Frequencies of equal temperament tuning - The English and American system versus the German system*Frequencies of musical notes
== Liên kết ngoài ==*Converter: Frequencies to note name, +/- cents*Note names, keyboard positions, frequencies and MIDI numbers*Music notation systems − Frequencies of equal temperament tuning - The English and American system versus the German system*Frequencies of musical notes