Air (Hellberg's Back to Summer Mix) is Hellberg's VIP (variation in production) of his, Teqq's, and Taylr Renee's original song Air. It was released on January 3, 2014.
This song is the first song on the Monstercat YouTube channel that didn't have the outro screen (Next Release screen, Merch link, etc). In the comments, Monstercat said this happened because of a rendering issue.
To find a VIP, find the artist's name under the alphabetized list. All of the artist's VIPs are listed with their name. For example, Mr FijiWiji's VIP of 'Yours Truly' would be under the 'M' tab, since the artist's name begins with the letter 'M'.