Have you ever heard of the All-Star Orchestra, led by former Seattle Symphony Orchestra conductor, Gerard Schwarz? Several years ago, Schwarz and his musician-colleagues came up with the idea to gather musicians of the top symphony orchestras of the United States to read and record orchestral literature in partnership with PBS and Khan Academy to promote "classical" music education and contemporary American Composers through high-quality video and audio recordings that are broadcast onto televisions, and are uploaded YouTube. Full episodes form seasons 1 & 2 are available via YouTube. Here's a video about this program above.
What is great about their YouTube channel is that there are videos that feature excerpts of particular instruments. This could provide hours of entertainment and information for both students and teachers! Click this LINK to view orchestra members of seasons 1 & 2. Below are videos highlighting horn, trombone, tuba, and trumpet excerpts: