Depends on the stand-up comedian. Most of the time, yes. Especially if said stand-up comedian is Frankie Boyle because everything sounds 50 times funnier in a Scottish accent. I have no idea why.
I have no idea. I haven't had one in well over a year, I don't think. My fingertips are pretty calloused from playing guitar for years so I don't think they tend to affect me. Probably around..sixth year, which was 2 years ago now? That's the last time I encountered textbooks heavy enough to give me a papercut.
I use it 100% of the time because iTunes refuses to work (which may have something to do with the fact that I refuse to update it, and haven't updated it since like...2011) and I don't have my music sorted on Media Player. And I get Premium for a fiver. Student perks.
Uh...I don't remember. My days consist of random mash-ups of lyrics that fit into whatever conversation that I'm having that I honestly don't remember what it was now. Singing out loud isn't a ground-breaking part of my day.