Update: Google have responded by stating this move was originally available in other countries and was rolled out last month to Australia, Canada, France, Ireland, Italy, Japan, New Zealand, and Sweden. They directed us to a post where the following was apparently the case:

A recent study found that after watching a music video on YouTube, 50% of adult users in the U.K. then go on to purchase music from that artist.

Google’s YouTube today last month rolled out an action based “Buy Song” advertisement that allows users to purchase the song they’re watching on YouTube in iTunes.

The move comes came shortly after the Performing Rights Society couldn’t reach a licensing agreement with YouTube in the UK.

It is believed that the advertisement is generated dynamically by searching for the meta fields in the video including the title and description.

Is the music industry and YouTube finally getting along? Tech Wired is currently waiting for comment from Google.