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.
There's a lot of different ways that a song would be a challenge to parody. There are a lot of songs that would ostensibly be a good candidate for parody, yet I can't think of a clever enough idea. Some songs are too repetitive for me to be able to fashion a humorous set of lyrics around. Some songs flat-out just don't work creatively for me.
My own personal tastes don't really have an effect on whether song is a parody target or not. But having said that, I try to pick songs that I actually like because I realize that I have to live with these songs for a long time, from when I'm working on them in the studio to possibly playing them onstage for the rest of my life. So I try not to pick songs that I know would drive me crazy.
I'd like to be able to be more topical and timely and more of-the-moment and I think the way to do that is, instead of waiting until I have twelve songs to release all at once, just to release them as I come up with them.