Arco is a recently release jailbreak collaboration between Jack Willis and Sentry. The release, which falls under the A3tweaks umbrella, places a visual music timeline indicator in your device's status bar.
The design of Arco is very much akin to the download animation that happens in the App Store in iOS 7. In iOS 7 there's a round circle indicator that wraps around a button, which is indicative of the download progress. In the case of Arco, the "progress" is in relation to a currently playing song.
Although it's a solid tweak, the best thing about Arco isn't about design or functionality. The great thing about Arco is where the money goes when you purchase a copy. A3tweaks has generously decided to forward all proceeds to Kyle Matthews' Because of Ezra charity, which helps to fund research for neuroblastoma, a terrible form of pediatric cancer.
