While playing recently, I noticed there were several advertisements for newly released albums. What made this advertisement different than the ones i've seen in the past, is there is the option to be directed to your iTunes on your iPhone to download the album if you are interested. The ads pop up quite frequently while playing. So the player sees them often. Even if they dont purchase the album, it raises awareness that the album is available.
The market surrounding this app is also very broad. People from all ages, locations, and backgrounds play. Advertisement placement throughout this app is brilliant.