Many artists have released apps for artists, Lady Gaga did this, having an app for her album Artpop. Fans can now share sites with others, who in turn share them with others, and streamers can be tracked by location, this is similar to old fashioned word of mouth, but has been taken to a whole new level with the incredible speed of in today's world of instant communication via the Internet and mobile devices, can be monitored and opens the door for further promotion. Bob Dylan with his album Sound Graffiti, used the technology - allowing fans to unlock preview songs from his next album by standing in specific locations around the world - an extraordinary promotional stunt that created a lot of buzz, and recently U2 they downloaded the latest album to everyone who had an i-tunes account – great news – promotion in short