Sue Perkins and Tom Service unravel everything you ever wanted to know about the symphony, but were too afraid to ask...
What relevance do symphonies have today? In Episode 5 of the series, the pair ask if the social and cultural ideas that gave birth to the symphony are still relevant today - and who's still composing symphonies at the dawn of the 21st century. Can you be considered a truly great composer if - like Chopin, Verdi and Delius - you haven't written one?
Don't forget, you can join in the conversation on Twitter by tweeting with the hashtag #r3symphonyqt, or visit the Radio 3 Facebook page: www.facebook.com/bbcradio3
You can also download the whole series as podcasts - visit http://www.bbc.co.uk/podcasts/series/symphony.