“amp” is a free music app for the iPhone OS 3.0 or later, developed by Vicious Dericious LLC. And, bafflingly, they’re offering it for free.

Baffling because it doesn’t just play music. Any old app could do that. The amp app is loaded down with features that are intuitive and easy to learn, and is set up to allow for easy customization so you can tailor it to be the music app you’ve always dreamed of. http://www.viciousdericious.com/index.php has screenshots, reviews, and a handy download link so you can have amp up and running on your iPhone, iPod Touch, or iPad in a matter of moments.

While you’re listening to a song, amp will display an artist info stream, which includes upcoming concert times and venues. Should one of those catch your eye, just tap your screen and amp will show you a venue map, detailed show times, and more. Want to know who’s playing near you? The amp oracle has you covered – discover new sounds playing near you. Share them with your friends instantly, with amp’s facebook and twitter connections.

amp even lets you select from custom skins, sort by genre – including audiobooks – and create your own playlists. Why are you still reading this? Try it out and see for yourself!