I first covered Winta (styled WINtA on the App Store) back at GDC Online in October, and found it an enjoyable music game from the creator of Parappa the Rapper, Masaya Matsuura. It's a simple title -- different shapes appear on screen, and the player is meant to tap them in order, which ends up going along with the rhythm of the song's vocals. There's one free track included with the app (which itself is free to download), and then a number of different songs are available via in-app purchase, each with their own themes and displays.
Plus, the whole project is part of the OneBigGame initiative, so 10 percent of the profits on each track purchased will go to two charities, Save the Children and the Starlight Children's Foundation, to support the lives of children around the world. OneBigGame has teamed up with both Matsuura and developers Triangle Studios to create the game, and Ngmoco has joined in to share the game (and some achievements) on its own Plus+ social network.
It's definitely an interesting title -- I wouldn't say it has quite the appeal of a game like Parappa the Rapper, but it's an interesting multi-touch take on the music genre, and helping out OneBigGame and its cause is definitely an excellent idea. If nothing else, give Winta (short for "War is Not the Answer") a free download and see what you think.