| 1. | the district of a city, esp. New York City, where most of the popular music is published. |
| 2. | the composers or publishers of popular music as a group. |
A reference to the popular music industry in the United States; the term is not used as much today as it was a generation or two ago.
Note: Tin Pan Alley is often associated with songwriters who are more interested in making money off their songs than in producing high-quality music.