Eine kleine Nachtmusik is one of my favorite Mozart pieces. Mozart is a little light for me, but it is hard not to get that opening line stuck in your head. I am more of a fan of the romantic era composers. Beethoven, Mahler, Tchaikovsky, and Saint-Saëns are my homies. Beethoven's Ninth Symphony is probably the best piece of music a human being has ever written. I get misty listening to it. Christopher Hogwood conducting the Academy of Ancient Music has a set of CDs where they run through
all of the Beethoven symphonies. Rawkin. That's all there is to it. Their rendition of Symphony No.9 is fucking transcendent. Even if you are not into classical music, you should probably own those discs.
Ahhh... Squats... Yes...
Not bad, but you need shoes. I probably yell at you about that every time you post. At the top, you are in mild flexion. Your upper back is round and your lower back is a little, too. I would like to see you drop your elbows and stand up a little straighter. On the whole, your squats are not bad except for number five, which went to hell and is essentially the logical outcome of a tendency you have on all of these — your knees are going a little too far forward. When it got hard, you went even further forward and got on to your toes.
Here is what I think you should do: get shoes, stand up straighter at the top, and work to stay off your toes. Think "heels." This may keep your knees back a little at the bottom.