F+ has introduced me to a lot of sweet music, like: The Hidden Cameras (I guess whoever edited that WikiHow episode really liked that band!), Rush And A Push And The Land Is Ours by The Smiths, Max Raabe, Book of the Month by Lovage, All I Have To Do Is Dream by the Everly Brothers (I really dig Oldies and I feel bad for not knowing about the song earlier), that Bitches Ain't Shit cover by Ben Folds (which is golden, especially the video), Popular by Nada Surf, and Carrie Anne by The Hollies.
I just listed stuff I liked enough to list on my Likes on YouTube, which is where I put my favorite music or videos I really enjoy and want to watch over and over.
And like everyone else here, I enjoyed that I'm A Flirt mashup too.
Onto the topic at hand, I enjoy the theme-fitting music, and it's kind of obvious whenever you guys can't find anything fitting, like the WikiHow episode I mentioned earlier. It's pretty rare, though.
I don't think I'd enjoy a F-Plus theme song that isn't The F-Plus Jingle.