well...

Million Song Dataset .... dodn´t really see context

movielens and grouplens datasets

The closest is the moviepilot dataset... which is no longer available

http://2012.recsyschallenge.com/tracks/camra/ ...

Building a dataset is a project in itself but in the last two years or so there has been a effort to provide academics with datasets so the recommendation system area can move more towards real-world applications

none the less there is much work to be done...

if you find anything please let me know :) i´m currently trying to find a similar dataset ... specifically something on music

if you are looking for I recommend dataset http://archive.ics.uci.edu/ml/

Incarmusic dataset

Baltrunas, Linas, et al. "Incarmusic: Context-aware music recommendations in a car." E-Commerce and web technologies (2011): 89-100.