Top 5: Biggest songs on iTunes

iTunes celebrates its 10th anniversary on Sunday.

iTunes celebrates its 10th anniversary on Sunday. Here is a look at the five most downloaded songs from the online retailer. 1. “I Gotta Feeling” by Black Eyed Peas

2. “Poker Face” by Lady Gaga

3. “Boom Boom Pow” by Black Eyed Peas

4. “I’m Yours” by Jason Mraz

5. “Viva la Vida” by Coldplay