"Although each year we have several sellout concerts in the Shed at Tanglewood, on average we sell about 80 percent of the capacity of the Shed," said Kim Noltemy, the Boston Symphony Orchestra's director of sales, marketing and communications, in a statement. "The rain may have kept some people away the last two seasons and gas prices may impact people's travel decisions this year, so this discount should encourage more people to experience the many joys of Tanglewood."

Tickets can be purchased at SymphonyCharge at 617-266-1200 or 888-266-1200, or at www.tanglewood.org.