He's sentient and can speak, why the heck would he be viewed as a pet?
As others have stated before, he's Twilight's assistant, not pet. Heck, he's practically Twilight's brother, assuming that they grew up together.
The most common ones among the Mane 6 are RariShy (or RariJack), PinkieDash, FlutterDash, PinkieShy, TwiDash I think. Although FlutterMac is rather common as well. And SoarinDash.
Judging from the music that you've put so far, the bands that you're most likely to like are probably Muse, Queen, and maybe Thirty Seconds to Mars.
OT: 8.5/10
Have some of the music that they play in Russia.
I assume that he's the one that gives music for movie companies to use?
Yep. They're of the Progressive Rock genre, which mixes rock and classical music.
OT: Couldn't understand anything, but still pretty cool. 8/10