The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
From Stefan Sturm:
TouchMusic - Control Your Music - Control your "Up Next" List. You select whats played next, no one else. You know the problem? You are listening to a song and want to select the next song. But no chance to do it with the build in music player? So here is the solution for that. Comfortable management of your "Up Next" list. Add, remove or even reorder your "Up Next" List - All your music at your finger tips. Control your music completely gesture based. Control your music just with gestures. From everywhere, not just the playing screen. In every list you play, pause or just to the next song. Even changing the volume is possible from everywhere. - All new Favorites ListDo you have a huge library with hundreds of Artist and Albums. Then just add your current favorites to your favorites list for easy and fast access. - Great Search FeaturesSearch in every list for Song, Artists or Albums. Or use the search view for a textual search over you complete library.Even more: - Full iPhone 5 support! - HD Retina graphics - Share on Facebook or Twitter - Works great with iTunes MatchAnd more to come :)