What are Alexander Graham Bell achievements and what was his impact on history?

Alexander Graham Bell's greatest accomplishments were the invention of the telephone (1876) and the refinement of the phonograph (1886). Bell revolutionized communication as we know it and paved the way for more inventors to improve communication as we know it now.

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answer: musical connotation

leonard b. meyer (1918-2007) was an american composer, author and philosopher. his work emotion and meaning in music is perhaps the first major treatise on music. it is a philosophical and psychological work, greatly influenced by koffka (one of the major proponents of gestalt psychology). his work deals with the problem of musical meaning and musical communication.