@Dragon: Owl City is mainstream, but most of the songs are unknown except a select few. (Fireflies to name one)
@Diaster: Not exactly a new song.
@SinisteRing:
Heard "Whataya Want From Me" liked it. Not new though, but ya it's a good song IMO. More of a mood song though, if you're not in the mood it's only average.
Heard "Big Time" and it's from an either Disney or Nick show that my little brother watches. Not a fan of it, maybe because of the show.
Haven't heard "Suddenly" it's okay, hasn't caught on to me as quick as most of your other suggestions do. Seems more like an average song that I'd just hear on like Top 40, and wouldn't bother asking the name of the song, but at the same time wouldn't mind it and would think "Hey, I've heard this" the second time I hear it. That being said, it's growing on me as I listen to it and type this.
For "You & Me" the link you gave me was blocked in my country, but I found another link. Assuming it's not a different version or something I haven't heard it and it's good, but it's not great. Didn't really listen to the lyrics very closely and it seems like a lyrical song though.
Heard "Need You Now" and I like it, however only at certain times. Good song when you are in the mood though.
Not sure if I've heard "Butterfly Wings". I feel like I have, but maybe only once, looking at the date it was posted, I probably haven't. I don't know, this song is average to me. It's like most of his songs, something I'd listen to but wouldn't really recommend or put on like a non-owlcity play list.
Haven't heard "Rugs From Me To You". It seemed short. I don't have an opinion on this one way or another. Average I guess, but not really catchy.
Heard "Naturally" and, despite the fact that she's a Disney child - it's pretty good. Selena Gomez herself is pretty cute though.
Find some better stuff that's not as mainstream, that isn't from bands that I really know etc. You're losing your touch.