I can't say enough good things about my band. I feel very fortunate that I found them when I did, very early in my career. Not only are they just great, nice guys; they're some of the best musicians you're likely to find. They do everything from gangsta rap to polka music and every genre in between. It's amazing.
In fact, when I come up with an idea for a parody I try to resist the urge to Google the idea to see if someone has done it already because the answer is almost always, "Yes, of course they have, they've thought of it!"
I write and write and write, and then I edit it down to the parts that I think are amusing, or that help the storyline, or I'll write a notebook full of ideas of anecdotes or story points, and then I'll try and arrange them in a way that they would tell a semi-cohesive story.
At this point I've got a bit of a track record. So people realize that when 'Weird Al' wants to go parody, it's not meant to make them look bad... it's meant to be a tribute.
It's hard to say, I picked one of my favorite articles for the MAD vault. Which is one of the features of the Magazine so they don't have to actually pay artists or writers to come up with new stuff.