Wednesday 8 January 2014, 13:00
**The Q&A has now finished. You can follow the questions and Charles Emmerson's answers by clicking here**
STOP PRESS! We've arranged a Twitterchat with historian Charles Emmerson, this week's guest on Essential Classics, from 430 pm to 530 pm on Thursday 9 January.
Tweet your questions for Charles using the hashtag #MusicOnTheBrink.
For full details of the WW1 - Music on the Brink season (including downloads) read this blog post.