The term popular music belongs to any of a number of musical genres "having wide appeal"[1][2] and typically distributed to large audiences through the music industry. It stands in contrast to both art music[3][4][5] and traditional music. Art music was historically disseminated through music notation, although since the advent of the recording industry, it is also disseminated through recordings. Traditional music forms such as early blues songs were passed orally, or to smaller, local audiences.[3][4][5] The original application of the term is to music of the 1880s Tin Pan Alley period in the United States.[1] Although popular music sometimes is known as "pop music", the two terms are not interchangeable.[6] Popular music is a generic term for music of all ages that appeals to popular tastes,[7] whereas pop music usually refers to a specific musical genre within popular music.