LOL!
You gotta learn to take the pressure off of yourself, darlin!
That's the biggest thing that's stopping you!
My first piece of advice (and I'm not a published author, so take it with a grain of salt) would be to, any time you have an idea, write it down.
Basically the way that I used to do it was: if I had an idea, I wrote it down. If one just wouldn't leave me alone, I'd get a notebook (or just a folder with paper stuffed inside it) and any time I had a line I came up with and liked, or heard, I would write it down and keep it in the folder. Or if I just came up with a twist, or a new character, it would be written down.
It meakes it easier when you get stuck. I'm also a big time user of outlines. Just because they keep me on track and if I don't know where I'm going, I'll never get there.
So if there's a story you're wanting to write, just start jotting stuff down as it comes to you - don't force yourself to write saying, "I'm going to do it now," becuase that's obviously putting more pressure on you than it is helping you.
Just take the stuff you jot down and put it in a folder, or a small shoe box, or keep it all in a notebook. (Although, I prefer to have paper that I can spread out, so I tend to use the notebook only in a bind or when I really just get the urge to write a section out.)
As far as music goes - it depends.
I have, literally, thousands of songs at my fingertips because they're on my computer. If I'm writing a scene filled with passion, and I want to listen to music, I'll generally use music that I think is passionate. The same thing goes with sad, happy, etc., etc.
Other than that, it just depends on what I'm in the mood for - if anything.
Another suggestion - don't just listen to music. If you can, set the entire scene. For romantic sections, I love lighting candles (well, I love them anyways, it just gives me an excuse!

). If you're writing something happy, go somewhere you know people are going to be happy.
Being around that kind of energy always helps when you're trying to convey it in a story because you're not just thinking about it or listening to it, but you're feeling it.
Now obviously, I can't just go to Italy if I'm writing something which is set in Rome, but I can do alot of research on it. (Or at least the parts that pertain to my story.) Learning more about that which you're writing is never a bad thing!
Lastly, if you can't get ideas or still get stuck with a writer's block (which can be hell sometimes!) talk to friends/family and ask where *they* would go with it. It might surprise you. If nothing else, you'll end up (sometimes) hearing such outlandish ideas that it'll take some of the pressure off.
And always get someone you
trust to read over it. You want someone who will be honest with you but not critical. Someone that can point out your weaknesses and your stengths. Heck, it can even be someone on the board!

I'll do it!
Just, no pressure, listen to what music you feel comfortable with - right now I'm stuck on Josh Groban, Andrea Bocelli, and Grant Lee Philips/Buffalo - and when you start getting too stressed, leave it for another day. It'll still be there waiting when you're ready!
And you know that you'll go through several drafts before it comes even close to what you want it to be. Very few people have the ability to get it almost right on the first time they write. Especially for original work!
Whew!
Do I ramble, or do I ramble?!
Ashley