And coming in at number one? Rock Band. Via Gametap:
"Though it's a relatively new genre, rhythm gaming already has a rich, deep history, filled with all different types of play styles, subgenres, and labels. So which ones are the cream of the crop? We've compiled our list, keeping the focus on games where a strict, rhythmic play style was enforced, and eliminating titles heavily influenced by music such as Rez, Lumines, or Everyday Shooter. The criteria would place a strong emphasis on music, quality of play, features and longevity. We also took into account opinions from the minds behind some of the most influential sites within the rhythm gaming community, all of whom are just as fanatical about these titles as we are. You may not recognize all 10 games here, but if you've cut your teeth on the chords of Guitar Hero and are hungry for more, each and every one of these demands your attention."