This deal from the Colorado Symphony is music to our ears! The symphony is performing “On the Beautiful Blue Danube” on Friday, April 21 and Saturday, April 22 at 7:30 p.m. each night. Old meets new with this orchestral triathalon of Austrian-influenced pieces—lead by world-renowned conductor Kevin John Edusei—shedding light on the development of Austrian cultural identity through music. Get tickets online and use promo code EARTHDAY to unlock $17 tickets (total price.) The discount is valid on all price levels. The regular ticket prices range from $29 to $89, so the savings really hit a high note. For the top ticket price ($89), it’s a savings of nearly 81%. (Don’t get too excited! Even though the tickets appear to be $6 each, with the promo code, the additional fees, in the end, make each ticket $17.) Limit two tickets per order, while supplies last. Let the music play!