Music notes are indeed named by letters of the alphabet. In the Western musical notation system, the notes are represented by the letters A, B, C, D, E, F, and G. These letters are used to identify the pitch of each note on the musical staff. Each letter corresponds to a specific pitch, and by combining them with other musical symbols, melodies and harmonies can be written and performed. Therefore, the statement "Music notes are named by letters of the alphabet" is true.