The Metropolitan Opera offers 200 orchestra seats for $20 2 hours prior to performances every Monday-Thursday (excluding galas, special events, and opening nights of new productions). For weekend performances, $25 seats are available through a weekly drawing. Sign up for the drawing every Monday for tickets for the upcoming weekend.
Created in 2005, Opera On Tap is a performance outlet for opera singers, similar to a rock or jazz gig at a local watering hole. Performers let their hair down, wear jeans, drink beer and try out new repertoire. Admission is usually free, with a bucket being sent around for donations. Check out this video for a quick primer. Updates on the current performance schedule here.
Carnegie Hall offers a limited number of rush tickets to Stern Auditorium/Perelman Stage concerts—even for sold out shows—for only $10 on a first come, first served basis. These tickets are available for purchase on the day of the concert in person at the Box Office. In addition, obstructed sight line and/or restricted legroom seats can be had in the Balcony, Dress Circle, and Second Tier of Stern Auditorium/Perelman Stage for 50% off (excludes Family Concerts and Galas). More information here.

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