Check out the concerts offered through artsticket Taiwan. The English translation is fairly minimal...
The most popular one is the NSO family concert. The first one is already sold out!
Under 12's 300
12 and up 500
Address: 臺北市中山堂光復廳 (臺北市延平南路98號) Yenping South Rd. No 98
Tickets online here. Only 89 left!