As a cellist, I obviously didn't even hear the video before posting it. But since it had the word "rant" I believe it's a good video for #3, Pachelbel's Canon:

The second one is the second movement of Johann Sebastian Bach's Orchestral Suite No. 3 in D major, BWV 1068, famously known for Wilhelm's arrangement as "air on the g string".

The first one... Well I guess some kind of fugue, but I just don't have the time to search further. The clefs are interesting and I guess they could lead somewhere, if someone wants to pick it up and win some sbd :) it's gotta be easy, since it sounds waaaay too familiar

Edit: HA, found it! It's the 4th movement of Mendelssohn's String Octet in e-flat major! The hint helped a lot, as did the clefs in finding it was a string octet, then the key also helped :)