Turkish page about mehter music:
http://www.kultur.gov.tr/TR/BelgeGoster.aspx?F6E10F8892433CFF1A9547B61DAFFE2A1ABB7EB6D1B95756

Same page in English:
http://www.kultur.gov.tr/EN/BelgeGoster.aspx?17A16AE30572D3138FE9074FF19B0005C19D2BE737C7E50A



KaDear