The first song that comes to my mind is Imma Be. When it was released as a digital single on itunes a long time ago I thought it was horrendous. Now I love it!
Lady Antebellum - "Need You Now" (song)
Orianthi - "According To You"
B.o.B - "Nothin' On You"
Rihanna - "Rated R"
Ke$ha - Animal" (album)
Green Day - "21st Century Breakdown" (album)
Imma Be - OMG I hated this when it was released as a single. When I bought the album though, I liked it a lot more...I originally thought that I would hate it on the radio as a single...but I ended up LOVING it!!
Nothing In This World - Paris Hilton - I know. I know. But this is a legit song.
La Roux's album - I thought that I would get tired of Elly's voice...NOPE!!! =)
Animal - Ke$ha
The Fame - Lady Gaga (Back in 2008)
A Girl Like Me - Rihanna (in 2006, before i became a stan)
V - Vanessa Hudgens (im a little stan now)
Songs:
Rock That Body (fergies robot voice is awful but i like that song 0.o
Meet Me Halfway
3 Worlds
Light Surrounding You
Poker Face
Fly On The Wall
)