In Japan, a tickets of the classical concert is very expensive.
If you would like to enjoy classical music at reasonable price,
I recommend you to go to Munetsugu Hall (Japanese only)
You can enjoy "Lunch Time Concert" for 1,000yen (not everyday)
The artists are not so popular now, but they are full of promise.
Munetsugu Hall is in Sakae.
Take Sakae subway exit 12.
Walk 5 min. to the East.