No. Polyphony is combining melodies at the same time. Mashups are melodies that are played at different times.
Screen Junkies MashUps - 2011 was released on: USA: 2 January 2011
The term "Web 2.0" is commonly associated with web development and web design which facilitate interactive information sharing, interoperability, user-centered design and collaboration on the World Wide Web. Examples of Web 2.0 include web-based communities, hosted services, web applications, social-networking sites, video-sharing sites, wikis, blogs, mashups and folksonomies.
the help of the creaters
Kelsey's Essentials - 2010 Amazing Mashups 5-9 was released on: USA: 28 August 2013
The Now - 2012 7 Amazing Video Mashups from 2012 1-24 was released on: USA: 2 January 2013
Screen Junkies MashUps - 2011 Dexter Morgan's Laboratory 1-2 was released on: USA: 12 October 2012
Mashups
LiveForNOW Music - 2012 Video Debuts Epic Mashups and Hall of Fame Inductees 2-5 was released on: USA: 28 November 2012
Rachael vs- Guy Kids Cook-Off - 2013 Cloudy with a Chance of Mashups 1-3 was released on: USA: 22 September 2013
Considering the releases of the past mashups, it will most likely will be released in late december.
You can get all of the past and present dj earworm music mashups on below site and there you go all the ones you want for free it goes to your itunes account automatically when it finishes downloading i tried!