Historically, the Kioicho district of Tokyo's Chiyoda ward was a popular destination for musicians. An event at the Tokyo Garden Terrace Kioicho aims to bring a slice of this vibrant culture back to the area with multiple concerts running from October 9th until November 7th.
The Kioicho Jazz Week (or jazz month, really!) provides a range of free and paid jazz concerts for music lovers to enjoy. The full list of events, times, and associated costs if applicable can be found on the official event site here. Do note that some of the events require advance reservations in order to participate.