If you ever use your Apple headphones to change to the next song by double-pressing on the center button on the inline mic, then check out a new free jailbreak tweak called NextVibrate
by iOS developer Abel Ingrand.
Normally, if your iPhone was in your pocket, and you were using your Apple headphones to switch to the next song, the song would just switch, end of story. But with this tweak installed, your iPhone will vibrate once every time that you use the Apple headphones' 'next song' feature.
It's a very pleasant type of haptic feedback that makes you feel like you did something right. It is very possible to accidentally pause the song instead of move to the next track, and that means you would hear nothing but silence, and you might be thinking to yourself, "wow, this next song is really quiet, or did I accidentally pause my music?"
With NextVibrate, you'll always know if you accidentally paused your music, or if you moved to the next song (even if it's one of those songs with a very quiet intro). The tweak will only make your iPhone vibrate if you successfully use the Apple headphones' 'next song' feature. If you pause your music by mistake, there will be no vibration, so you'll know immediately if you paused the music or skipped to the next one.
NextVibrate has no options to configure, and if you want to give the tweak a try, it's available for free in Cydia's BigBoss repository. Because the tweak depends on a vibration feature, it's only compatible with iPhones.
iPhone 5 running iOS 7.0.6