CarTunes Music Player is the perfect app for the road or the gym. It lets you use gestures as music controls so you don't need to look at the device to control your music.
Upon launch, CarTunes will go through a brief tutorial showing you the main gestures to play a song, how to quickly move from track to track, and other options using a swipe-controlled interface. Simply touch to play, swipe left or right to switch tracks, or touch and hold in the middle to control a volume knob. To add songs and control the apps settings, swipe upward to open the app's menu. From here you can create and edit a playlist using songs from your music library, change what information each track shows on screen, and switch the font to your liking. You also get a menu that shows you all of your available gestures, with some options that might make it easier for you to use (you can switch volume control to a single vertical swipe, for example, if that's easier than using the volume knob). You can assign other functions to more complex gestures (a three-finger tap, for example) as well, making it easy to set the app up just the way you like it.
Overall, CarTunes Music Player is an excellent idea that makes it easy to control your music without looking at your iPhone--perfect for when you're on a road trip or exercising and don't have time to fiddle with controls.
From Ryan Oksenhorn:
CarTunes is the freshest iOS music player, designed entirely for touch. Control your music with swipes, taps, and pinches. CarTunes is ideal for listening to music anytime. At the gym, on the road, or lying in bed. With more than 1 million downloads, CarTunes is a #1 App internationally. Rated. by hundreds of reviewers. See what everyone's raving about: d Controlling your music couldn't be easier. Full gesture control. Tap anywhere to play & pause music. Flick to change tracks. Slide to change volume. Pull down to instantly tweet. Two-finger flick to shuffle. Slide to seek forward and backward. Pinch to play current song's album or artist. d Runs full screen on your iPhone or iPad. Full iPhone 5 support. There is NO better way to see, hear, and control your music than with CarTunes. HD Retina graphics custom for iPhone and iPad. Great on the large iPad, great in your pocket. d Tweet your music easier than ever. CarTunes auto-fills a tweet with the current artist and the gorgeous album artwork. Just pull down to tweet the current song. d Your music never looked so good. Gorgeous full-screen artwork. HD Retina graphics. Colors & visuals adapt dynamically to match each song. Change the font to match the mood of your music. View a wall of album artwork for choosing music. Tweet your music with the album artwork attached. Optimized for both iPhone and iPad screens. d Choose your music with just a tap. Instantly access your full library with one flick. Innovative design & interface. Find your music by its artwork. Sort by songs, albums, artists, playlists, & podcasts. View your music in a gorgeous grid of artwork. Music keeps playing when you close the app. d Tons more features included. Gesture customization. Appearance settings. Auto-play and auto-pause. New features coming each week.