Imagine Dance Dance Revolution, Karaoke Revolution, and finger skateboarding got thrown in a blender and set to frappe. What you'd get is Lyric Legend 2, a new game where the object is to tap the words at the correct time with the music.
The game comes with three songs, which may vary by date of install (mine were "Gimme Sympathy," "Move Along," and "She Takes Me High"), but additional two-song packs by artist can be purchased for about a dollar.
The music selection available is fairly current and the game seems solidly made and fun. There is a free music section which, along with the paid section, hopefully will have new artists added regularly.
It's a pretty fun little game, though I'd advise the use of headsets or not being around people since it requires some focused concentration and listening abilities.