In the 1960s, plastic and electric toys became more popular with the invention of cheap alkaline batteries.  Toy manufacturers were making toys electronic any way possible.  If a toy was electric, that meant it was “new.”  Nevertheless, music learning also included non-electronic ‘hands-on’ musical toys such as toy guitars, rhythm sets, and musical windup and pull toys.
Especially trendy was the idea of making theme toys named after something in the movies, on TV or other kinds of media, such as Mr. Rogers’ Neighborhood; Disney’s Mickey Mouse and Donald Duck; Warner Brothers Bugs Bunny and Tweety Bird.  And let’s not forget, we had the English rock band invasion, known as the Beatles.  This idea of musical theme toys really took hold by the 1960s and stuck around for the years to come.