HeadphoneLauncher is a modification that will help you quickly open your music applications when connecting the headphones.

When you have your iPhone locked and connect the headphones appear on your lock screen application launcher for your application can quickly open Music, YouTube, Spotify or any radio, basically the application you want, you configure it from the settings, although designed for music applications.

You can download for $ 0.99 in Cydia, you'll find BigBoss repo. You need to have jailbroken your device.