If you’ve longed for a behind-the-scenes glimpse of the orchestra at work, tomorrow’s your chance.

The PSO is opening Heinz Hall to the public from 7 a.m.-2 p.m. on Wed., March 2.

You can actually check out an orchestra rehearsal from 10 a.m. to 12:30 pm. Tours of the building follow until 2 p.m.

The day’s festivities at 600 Penn Ave., Downtown, also include prize drawings, free food and coffee.

Along the way, expect at least a little bit of an additional sales pitch: Tomorrow only, the PSO is offering 50 percent off introductory tickets to the 2010-2011 BNY Mellon Grand Classics.

The special four-concert subscriptions can be purchased by phone at 412-392-4900 or online at www.pittsburghsymphony.org.