C4: 261.62557 Hz #C4: 277.18263 Hz D4: 293.66477 Hz #D4: 311.12698 Hz E4: 329.62756 Hz F4: 349.22823 Hz #F4: 369.99442 Hz G4: 391.99544 Hz #G4: 415.30470 Hz A4: 440.00000 Hz #A4: 466.16376 Hz B4: 493.88330 Hz C5: 523.25113 Hz