I only wish there were more people watching Yuukarin play. She certainly looks dressed up for this occasion, and judging by Wriggle's face, she's doing surprisingly well.
I can see a relation to Vivaldi's "Summer", but it just doesn't feel like what she would be playing here. I'm thinking more Tchaikovsky's 'Violin Concerto in D major, Op. 35' or Bach's 'Violin Concerto in A minor BWV 1041'.