(Here is a link to the song "Cecilia" by Simon and Garfunkel)

I remember looking this up on YouTube one time, and in the description of the video (I believe it's video I have linked, actually), it states that it is unclear whether the song refers to a flippy floppy lover who can't make up her mind...or if it refers to St. Cecilia, patron saint of musicians, and the frustrations/joys That come with songwriting.
So which is it? Well, let's take a look at the lyrics (at least, my interpretation -- they may or may not agree with yours).
"Cecilia, you're breaking my heart/You're shaking my confidence daily."
Lover POV: Obviously, this is referring to how the narrator feels in regards to Cecilia, his lover. He loves her, or at the very least is deeply attracted to her...But her antics are probably causing him to pull his hair out. I mean, clearly he is losing confidence in her from her constant comings and goings.
Saint POV: ....But at the same time, this could be referring to the bumps on the road to writing a good song. Perhaps the narrator has prayed to Saint Cecilia, but has gotten few things in return, in regards to muse, inspiration, motivation, etc. And, if your career is solely songwriting, every good song counts. On the same side, perhaps the narrator is having his confidence "shaken" because he is constantly worried about whether or not he still has the "stuff" to write a hit.
"Oh Cecilia, I'm down on my knees/I'm begging you please to come home/Come on home."
Lover POV: "Please stop leaving me! Can't you see I love you? Stay here with me tonight, at home."
Saint POV: Again, the narrator is vocalizing his frustrations, begging Saint Cecilia to not abandon him or leave him muse-less.
"Making love in the afternoon with Cecilia/Up in my bedroom."
Lover POV: Alright, so these next few verses are what give credence to the lover perspective. Which means that these two verses are rather obvious: He's upstairs, in his bedroom, making love to Cecilia. (And, I'm assuming, taking precautions against the arrival of unexpected bundles of joy.)
​Saint POV: It's really weird to consider the narrator making love to a saint, especially since Saint Cecilia had sworn herself to Maidenhood -- even in marriage (You can read more about this here, on Wikipedia). Plus, she's dead. Necrophilia, anyone? But what if we stop thinking about it literally, and treat it more like a metaphor? In that case, "making love" could be an allusion to what artists (using this term to describe literary, musical, and artistic artists, here and everywhere else) feel when their muse is flowing profoundly. You feel spectacular, glorious, joyful...almost like you're on a bubbly high or, hrm, in bed with a loved one. You know, the whole "ZOMG THIS IS GONNA BE SO AWESOMEEE!!!!!!!!!" As for the bedroom? Well, I prefer sitting on my bed when I'm writing a post or working on some art. Perhaps the narrator feels the same? (A bit of a stretch, I know, but it works.)
"I got up to wash my face/When I come back to bed/Someone's taken my place."
Lover POV: As soon as the narrator left, Cecilia booked it to make another booty call, or something of that nature. Poor narrator, my heart goes out to him on this one.
Saint POV: My heart still goes out to the narrator, but for a different reason. This is akin to what happens when artists have to break their concentration to do something else. In this instance, the narrator had to go wash his face (probably to wake himself up, if it was late and he'd been working for a while). When he gets back, he realises Saint Cecilia has gone and taken his muse to go help some other poor sod. Which could also explain the last two verses, especially if you treat them as being metaphorical, too.
"Jubilation, she loves me again/I fall on the floor and I laughing."
Lover POV: The narrator is ecstatic that Cecilia has come back to him, but when she professes her love, he can't help but laugh. And can you really blame him? This twat keeps flipping back and forth between him and other men -- but now she's saying she loves him? Obviously, he knows it won't last very long, especially when another cute guy comes around.
​Saint POV: Similar to the Lover POV, the narrator has discovered that Saint Cecilia has blessed him with muse. Again. As grateful as he is for it, he can't help but laugh, for he knows it will continue to come and go, with nothing he can do to prevent it.

So what do you think? Do you think this song is really just about a "capricious lover"? Or do you think it's true meaning is about the grief and jubilation that go into making a great song, with Saint Cecilia used to give it a more personable concept?
Or do you not care at all about that stuff, and just like to listen to the song? Because that's ok too, I guess. :p