I have looked around but haven't found an app yet that does this. I listen to music every time I walk and here in Canada its cold. So when I am walking around and my iphone is in my pocket I don't want to take it out to switch to a different artist, playlist etc. A voice control app for it would be amazing where I could say "play Rolling Stones" and it would start playing that artist. I remember seeing Fonix iSpeak which said it would be able to do it but when the app was released it didn't have that control. So if someone has this app please let me know.