By Sam Sutherland
The singles of yore have mostly dissolved into the digital world's sea of a
la carte tracks: Songs the label and artist want you to hear (and radio to
play), push tracks from albums, remixes and mixtape highlights can all pop up on
personal playlists. MSN Music's panel of editors and contributors cast their
votes and this year actually included more conventional hits than in 2011, with
some obvious (and irresistible) earworms dominating the voting. With ties, our
putative top 10 list expanded into an even dozen.