A little bit of opera is the high note of any evening out. Enjoy your choice of pitch-perfect performances with today's deal from Dicapo Opera Theater: Pay $55 for two tickets and two refreshments from this non-profit theater on East 76th Street (a $110 value). Use your voucher to attend your choice of two phenomenal plays -- catch Thomas Pasatieri's The Martyrs on November 16; or snag a spot at Bill Van Horn's biographical portrait piece Marrying Mozart on December 13, 14, or 15. For more than 30 years Dicapo has been staging full seasons of opera performances in its opulently restored theater, and these two world premieres make a worthy addition to the organizations overture. Want more? Check out the Dicapo Opera Theater on Facebook.