An experience of violin concerto in YouTube video -- difficult in live concerts
I happened to look at a page in YouTube, and wrote a comment. The video is on Tchaikovsky's Violin Concerto played by Sayaka Shoji.
This video shows the facial expressions of the violinist very well. She shows both her emotion and technical issues. She seems to synchronize her performance with the orchestra by looking at the conductor (and probably by communicating with him). It is difficult to see such expressions in concerts.