iTunes

iTunes is a proprietary digital media player application, used for playing and organizing digital music and video files. The application is also an interface to manage the contents on Apple's iPod and iPhone lines, as well as the iPad.

Films, television programs, music videos, podcasts, and the App Store (for the iPhone, iPod Touch and iPad) have been added to iTunes' extensive store catalog.

On January 6, 2009, Phil Schiller announced in his Macworld 2009 keynote speech that over 6 billion songs had been downloaded since the service first launched on April 28, 2003, making it the largest online music store in the world.

At the previous Macworld Expo 2008, Apple CEO Steve Jobs stated that the service had set a new single day record of 20 million songs on December 25, 2007

The iTunes movie catalog includes content from 20th Century Fox, Warner Bros., Walt Disney Pictures, Paramount Pictures, Universal Studios, and Sony Pictures Entertainment

Source

The iTunes music store continued it's phenomenal growth in 2005 with a 241% increase in site traffic, according to research gathered by Nielsen NetRatings, taking the number of users from 6.1 million to 20.7 million - that's over 14% of active net users.

More interestingly, Nielsen NetRatings also tried to find out who those users were. The biggest age group was 12-17 year olds, with a slight bias towards male users.

iTunes would be a great place to promote a music video, it is the most used music purchasing program and in 2006 it was recorded there was 20.1 million uses (There would be a lot more than that now). That is a massive market which could see your video, as iTunes is used all over the world your music video could be seen worldwide. You would have to seek permission from all parties involved so for our case it would have to be the artist/song writer of the song we are using.