In Japan, rock and other music played by bands are more underground, compared with US or UK. However, there are concerts of local bands almost every night somewhere in Tokyo. Which means, joining these events, you can experience the more deep side of Tokyo. Depending on your preference/interest of music, I take you to a musical events that you can enjoy and find a musician with potential of future success.
It is possible to have same a kind of tour in Kyoto or Osaka, if schedule matches (my hometown is Osaka so)
Again, participation of a child may be inappropriate if an event is held at night . Please avoid wearing high heels
A ticket for a concert (usually incl. 1 drink), Your and my Transportation Expenses, Translation (En⇔JP) if needed