21. He also is set to conduct a week of subscription concerts featuring Mahler's Symphony No . 6. 22. In subsequent seasons the entertainments included a mixture of assemblies, masquerades ( masked balls ) and subscription concerts . 23. The season expanded to seven subscription concerts , and the orchestra began playing concerts in surrounding towns and communities. 24. Argerich had cancelled her appearances with the Boston Symphony Orchestra on four subscription concerts from March 8 to 13. 25. In addition to subscription concerts ( the number varies annually ), there are other performances on special occasions. 26. He signed a three-year contract and will lead 10 weeks of subscription concerts and youth programs each season. 27. He played in the Bach-Abel concerts which were London s first subscription concert series, started in 1765. 28. He later moved to Z�rich, where he served as leader of the General Music Society's subscription concerts series. 29. In 1936, the ABC introduced Celebrity Subscription Concerts , and artists and conductors many from overseas were engaged. 30. The second public performance was at the Leipzig Gewandhaus on 10 January 1833, as part of the annual subscription concerts .