Tin Pan Alley Output refers to the popular music genre that emerged in the late 19th century in New York City. The term is derived from the name of a street in lower Manhattan where many music publishers and songwriters had their offices. This genre of music was characterized by catchy melodies, simple lyrics, and often featured ragtime rhythms. The term 'Tin Pan Alley Output' is often used to refer to the songs that were written and published during this period.