The first video shows an impressive accordion transcription of “Summer,” from Vivaldi’s Four Seasons. While it may not require a critical review, I encourage you to enjoy this impressive and entertaining performance.
The other two videos are even more impressive, and have have been around the internet for about a year. They include the final movement of the Tchaikovsky Violin Concerto (both solo and orchestra parts), and Wieniawski’s Scherzo and Tarantelle for violin and piano.