Which composer advised songwriters to keep their melodies within a limited range for memorability?

Harry von Tilzer is recognized for his emphasis on the importance of melody in popular music, particularly in the early 20th century. He advised songwriters to keep their melodies within a limited range, which contributes significantly to a song's memorability. This approach is grounded in the understanding that melodies that are too wide or complex can be difficult for listeners to remember or sing along with. By encouraging a narrow melodic range, Tilzer helped to shape catchy and accessible tunes that could easily resonate with audiences, thereby enhancing the success of popular songs during his era. This principle remains relevant in songwriting as it ensures that melodies are both memorable and singable, key qualities for engaging listeners.